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2021

Optical secret sharing with cascaded metasurface holography

P. Georgi, Q. Wei, B. Sain, C. Schlickriede, Y. Wang, L. Huang, T. Zentgraf, Science Advances (2021), 7(16), eabf9718

<jats:p>Secret sharing is a well-established cryptographic primitive for storing highly sensitive information like encryption keys for encoded data. It describes the problem of splitting a secret into different shares, without revealing any information to its shareholders. Here, we demonstrate an all-optical solution for secret sharing based on metasurface holography. In our concept, metasurface holograms are used as spatially separable shares that carry encrypted messages in the form of holographic images. Two of these shares can be recombined by bringing them close together. Light passing through this stack of metasurfaces accumulates the phase shift of both holograms and optically reconstructs the secret with high fidelity. In addition, the hologram generated by each single metasurface can uniquely identify its shareholder. Furthermore, we demonstrate that the inherent translational alignment sensitivity between two stacked metasurface holograms can be used for spatial multiplexing, which can be further extended to realize optical rulers.</jats:p>

Georgi, Philip, Qunshuo Wei, Basudeb Sain, Christian Schlickriede, Yongtian Wang, Lingling Huang, and Thomas Zentgraf. “Optical Secret Sharing with Cascaded Metasurface Holography.” Science Advances 7, no. 16 (2021). https://doi.org/10.1126/sciadv.abf9718.


Recent progress on metasurfaces: applications and fabrication

G. Yoon, T. Tanaka, T. Zentgraf, J. Rho, Journal of Physics D: Applied Physics (2021), 54, 383002

Yoon, Gwanho, Takuo Tanaka, Thomas Zentgraf, and Junsuk Rho. “Recent Progress on Metasurfaces: Applications and Fabrication.” Journal of Physics D: Applied Physics 54 (2021). https://doi.org/10.1088/1361-6463/ac0faa.


Dielectric travelling wave antennas for directional light emission

T. Leuteritz, H. Farheen, S. Qiao, F. Spreyer, C. Schlickriede, T. Zentgraf, V. Myroshnychenko, J. Förstner, S. Linden, Optics Express (2021), 29(10), 14694

We present a combined experimental and numerical study of the far-field emission properties of optical travelling wave antennas made from low-loss dielectric materials. The antennas considered here are composed of two simple building blocks, a director and a reflector, deposited on a glass substrate. Colloidal quantum dots placed in the feed gap between the two elements serve as internal light source. The emission profile of the antenna is mainly formed by the director while the reflector suppresses backward emission. Systematic studies of the director dimensions as well as variation of antenna material show that the effective refractive index of the director primarily governs the far-field emission pattern. Below cut off, i.e., if the director’s effective refractive index is smaller than the refractive index of the substrate, the main lobe results from leaky wave emission along the director. In contrast, if the director supports a guided mode, the emission predominately originates from the end facet of the director.

Leuteritz, T., H. Farheen, S. Qiao, F. Spreyer, Christian Schlickriede, Thomas Zentgraf, Viktor Myroshnychenko, Jens Förstner, and S. Linden. “Dielectric Travelling Wave Antennas for Directional Light Emission.” Optics Express 29, no. 10 (2021). https://doi.org/10.1364/oe.422984.


Extremely low-energy ARPES of quantum well states in cubic-GaN/AlN and GaAs/AlGaAs heterostructures

M. Hajlaoui, S. Ponzoni, M. Deppe, T. Henksmeier, D.J. As, D. Reuter, T. Zentgraf, G. Springholz, C.M. Schneider, S. Cramm, M. Cinchetti, Scientific Reports (2021), 11, 19081

<jats:title>Abstract</jats:title><jats:p>Quantum well (QW) heterostructures have been extensively used for the realization of a wide range of optical and electronic devices. Exploiting their potential for further improvement and development requires a fundamental understanding of their electronic structure. So far, the most commonly used experimental techniques for this purpose have been all-optical spectroscopy methods that, however, are generally averaging in momentum space. Additional information can be gained by angle-resolved photoelectron spectroscopy (ARPES), which measures the electronic structure with momentum resolution. Here we report on the use of extremely low-energy ARPES (photon energy ~ 7 eV) to increase depth sensitivity and access buried QW states, located at 3 nm and 6 nm below the surface of cubic-GaN/AlN and GaAs/AlGaAs heterostructures, respectively. We find that the QW states in cubic-GaN/AlN can indeed be observed, but not their energy dispersion, because of the high surface roughness. The GaAs/AlGaAs QW states, on the other hand, are buried too deep to be detected by extremely low-energy ARPES. Since the sample surface is much flatter, the ARPES spectra of the GaAs/AlGaAs show distinct features in momentum space, which can be reconducted to the band structure of the topmost surface layer of the QW structure. Our results provide important information about the samples’ properties required to perform extremely low-energy ARPES experiments on electronic states buried in semiconductor heterostructures.</jats:p>

Hajlaoui, Mahdi, Stefano Ponzoni, Michael Deppe, Tobias Henksmeier, Donat Josef As, Dirk Reuter, Thomas Zentgraf, et al. “Extremely Low-Energy ARPES of Quantum Well States in Cubic-GaN/AlN and GaAs/AlGaAs Heterostructures.” Scientific Reports 11 (2021). https://doi.org/10.1038/s41598-021-98569-6.


Nonlinear Bicolor Holography Using Plasmonic Metasurfaces

D. Frese, Q. Wei, Y. Wang, M. Cinchetti, L. Huang, T. Zentgraf, ACS Photonics (2021), 8(4), pp. 1013-1019

Frese, Daniel, Qunshuo Wei, Yongtian Wang, Mirko Cinchetti, Lingling Huang, and Thomas Zentgraf. “Nonlinear Bicolor Holography Using Plasmonic Metasurfaces.” ACS Photonics 8, no. 4 (2021): 1013–19. https://doi.org/10.1021/acsphotonics.1c00028.


Selective Etching of (111)B-Oriented AlxGa1−xAs-Layers for Epitaxial Lift-Off

T. Henksmeier, M. Eppinger, B. Reineke, T. Zentgraf, C. Meier, D. Reuter, physica status solidi (a) (2021), 218(3), pp. 2000408

GaAs-(111)-nanostructures exhibiting second harmonic generation are new building blocks in nonlinear optics. Such structures can be fabricated through epitaxial lift-off using selective etching of Al-containing layers and subsequent transfer to glass substrates. Herein, the selective etching of (111)B-oriented AlxGa1−xAs sacrificial layers (10–50 nm thick) with different aluminum concentrations (x = 0.5–1.0) in 10\% hydrofluoric acid is investigated and compared with standard (100)-oriented structures. The thinner the sacrificial layer and the lower the aluminum content, the lower the lateral etch rate. For both orientations, the lateral etch rates are in the same order of magnitude, but some quantitative differences exist. Furthermore, the epitaxial lift-off, the transfer, and the nanopatterning of thin (111)B-oriented GaAs membranes are demonstrated. Atomic force microscopy and high-resolution X-ray diffraction measurements reveal the high structural quality of the transferred GaAs-(111) films.

Henksmeier, Tobias, Martin Eppinger, Bernhard Reineke, Thomas Zentgraf, Cedrik Meier, and Dirk Reuter. “Selective Etching of (111)B-Oriented AlxGa1−xAs-Layers for Epitaxial Lift-Off.” Physica Status Solidi (A) 218, no. 3 (2021): 2000408. https://doi.org/10.1002/pssa.202000408.


A Versatile Metasurface Enabling Superwettability for Self‐Cleaning and Dynamic Color Response

J. Lu, B. Sain, P. Georgi, M. Protte, T. Bartley, T. Zentgraf, Advanced Optical Materials (2021), 2101781

Metasurfaces provide applications for a variety of flat elements and devices due to the ability to modulate light with subwavelength structures. The working principle meanwhile gives rise to the crucial problem and challenge to protect the metasurface from dust or clean the unavoidable contaminants during daily usage. Here, taking advantage of the intelligent bioinspired surfaces which exhibit self-cleaning properties, a versatile dielectric metasurface benefiting from the obtained superhydrophilic or quasi-superhydrophobic states is shown. The design is realized by embedding the metasurface inside a large area of wettability supporting structures, which is highly efficient in fabrication, and achieves both optical and wettability functionality at the same time. The superhydrophilic state enables an enhanced optical response with water, while the quasi-superhydrophobic state imparts the fragile antennas an ability to self-clean dust contamination. Furthermore, the metasurface can be easily switched and repeated between these two wettability or functional states by appropriate treatments in a repeatable way, without degrading the optical performance. The proposed design strategy will bring new opportunities to smart metasurfaces with improved optical performance, versatility, and physical stability.

Lu, Jinlong, Basudeb Sain, Philip Georgi, Maximilian Protte, Tim Bartley, and Thomas Zentgraf. “A Versatile Metasurface Enabling Superwettability for Self‐Cleaning and Dynamic Color Response.” Advanced Optical Materials, 2021. https://doi.org/10.1002/adom.202101781.


A wavelength and polarization selective photon sieve for holographic applications

D. Frese, B. Sain, H. Zhou, Y. Wang, L. Huang, T. Zentgraf, Nanophotonics (2021)

Optical metasurfaces are perfect candidates for the phase and amplitude modulation of light, featuring an excellent basis for holographic applications. In this work, we present a dual amplitude holographic scheme based on the photon sieve principle, which is then combined with a phase hologram by utilizing the Pancharatnam–Berry phase. We demonstrate that two types of apertures, rectangular and square shapes in a gold film filled with silicon nanoantennas are sufficient to create two amplitude holograms at two different wavelengths in the visible, multiplexed with an additional phase-only hologram. The nanoantennas are tailored to adjust the spectral transmittance of the apertures, enabling the wavelength sensitivity. The phase-only hologram is implemented by utilizing the anisotropic rectangular structure. Interestingly, such three holograms have quantitative mathematical correlations with each other. Thus, the flexibility of polarization and wavelength channels can be utilized with custom-tailored features to achieve such amplitude and phase holography simultaneously without sacrificing any space-bandwidth product. The present scheme has the potential to store different pieces of information which can be displayed separately by switching the wavelength or the polarization state of the reading light beam.

Frese, Daniel, Basudeb Sain, Hongqiang Zhou, Yongtian Wang, Lingling Huang, and Thomas Zentgraf. “A Wavelength and Polarization Selective Photon Sieve for Holographic Applications.” Nanophotonics, 2021. https://doi.org/10.1515/nanoph-2021-0440.


Influence of Plasmon Resonances and Symmetry Effects on Second Harmonic Generation in WS2–Plasmonic Hybrid Metasurfaces

F. Spreyer, C. Ruppert, P. Georgi, T. Zentgraf, ACS Nano (2021), 15(10), pp. 16719-16728

The nonlinear process of second harmonic generation (SHG) in monolayer (1L) transition metal dichalcogenides (TMD), like WS2, strongly depends on the polarization state of the excitation light. By combination of plasmonic nanostructures with 1L-WS2 by transferring it onto a plasmonic nanoantenna array, a hybrid metasurface is realized impacting the polarization dependency of its SHG. Here, we investigate how plasmonic dipole resonances affect the process of SHG in plasmonic–TMD hybrid metasurfaces by nonlinear spectroscopy. We show that the polarization dependency is affected by the lattice structure of plasmonic nanoantenna arrays as well as by the relative orientation between the 1L-WS2 and the individual plasmonic nanoantennas. In addition, such hybrid metasurfaces show SHG in polarization states, where SHG is usually forbidden for either 1L-WS2 or plasmonic nanoantennas. By comparing the SHG in these channels with the SHG generated by the hybrid metasurface components, we detect an enhancement of the SHG signal by a factor of more than 40. Meanwhile, an attenuation of the SHG signal in usually allowed polarization states is observed. Our study provides valuable insight into hybrid systems where symmetries strongly affect the SHG and enable tailored SHG in 1L-WS2 for future applications.

Spreyer, Florian, Claudia Ruppert, Philip Georgi, and Thomas Zentgraf. “Influence of Plasmon Resonances and Symmetry Effects on Second Harmonic Generation in WS2–Plasmonic Hybrid Metasurfaces.” ACS Nano 15, no. 10 (2021): 16719–28. https://doi.org/10.1021/acsnano.1c06693.


Nonlinear Imaging of Nanoscale Topological Corner States

S.S. Kruk, W. Gao, D. Choi, T. Zentgraf, S. Zhang, Y. Kivshar, Nano Letters (2021), 21(11), pp. 4592–4597

Topological states of light represent counterintuitive optical modes localized at boundaries of finite-size optical structures that originate from the properties of the bulk. Being defined by bulk properties, such boundary states are insensitive to certain types of perturbations, thus naturally enhancing robustness of photonic circuitries. Conventionally, the N-dimensional bulk modes correspond to (N – 1)-dimensional boundary states. The higher-order bulk-boundary correspondence relates N-dimensional bulk to boundary states with dimensionality reduced by more than 1. A special interest lies in miniaturization of such higher-order topological states to the nanoscale. Here, we realize nanoscale topological corner states in metasurfaces with C6-symmetric honeycomb lattices. We directly observe nanoscale topology-empowered edge and corner localizations of light and enhancement of light–matter interactions via a nonlinear imaging technique. Control of light at the nanoscale empowered by topology may facilitate miniaturization and on-chip integration of classical and quantum photonic devices.

Kruk, Sergey S., Wenlong Gao, Duk-Yong Choi, Thomas Zentgraf, Shuang Zhang, and Yuri Kivshar. “Nonlinear Imaging of Nanoscale Topological Corner States.” Nano Letters 21, no. 11 (2021): 4592–4597. https://doi.org/10.1021/acs.nanolett.1c00449.


Nonlinear metasurface combining telecom-range intersubband transitions in GaN/AlN quantum wells with resonant plasmonic antenna arrays

J. Mundry, F. Spreyer, V. Jmerik, S. Ivanov, T. Zentgraf, M. Betz, Optical Materials Express (2021), 11(7), 2134

We realize and investigate a nonlinear metasurface taking advantage of intersubband transitions in ultranarrow GaN/AlN multi-quantum well heterostructures. Owing to huge band offsets, the structures offer resonant transitions in the telecom window around 1.55 µm. These heterostructures are functionalized with an array of plasmonic antennas featuring cross-polarized resonances at these near-infrared wavelengths and their second harmonic. This kind of nonlinear metasurface allows for substantial second-harmonic generation at normal incidence which is completely absent for an antenna array without the multi-quantum well structure underneath. While the second harmonic is originally radiated only into the plane of the quantum wells, a proper geometrical arrangement of the plasmonic elements permits the redirection of the second-harmonic light to free-space radiation, which is emitted perpendicular to the surface.

Mundry, Jan, Florian Spreyer, Valentin Jmerik, Sergey Ivanov, Thomas Zentgraf, and Markus Betz. “Nonlinear Metasurface Combining Telecom-Range Intersubband Transitions in GaN/AlN Quantum Wells with Resonant Plasmonic Antenna Arrays.” Optical Materials Express 11, no. 7 (2021). https://doi.org/10.1364/ome.426236.


2020

Metasurfaces help lasers to mode-lock

B. Sain, T. Zentgraf, Light: Science & Applications (2020), 9, pp. 67

Sain, Basudeb, and Thomas Zentgraf. “Metasurfaces Help Lasers to Mode-Lock.” Light: Science & Applications 9 (2020): 67. https://doi.org/10.1038/s41377-020-0312-1.


Plasmonic metasurfaces for controlling harmonic generations

T. Zentgraf, S. Chen, G. Li, S. Zhang, in: Nanoantennas and Plasmonics: Modelling, design and fabrication, The Institution of Engineering and Technology, 2020

Zentgraf, Thomas, Shumei Chen, Guixin Li, and Shuang Zhang. “Plasmonic Metasurfaces for Controlling Harmonic Generations.” In Nanoantennas and Plasmonics: Modelling, Design and Fabrication, edited by Douglas H. Werner, Sawyer D. Campbell, and Lei Kang. The Institution of Engineering and Technology, 2020. https://doi.org/10.1049/SBEW540E_ch8.


Polarization-Encrypted Orbital Angular Momentum Multiplexed Metasurface Holography

H. Zhou, B. Sain, Y. Wang, C. Schlickriede, R. Zhao, X. Zhang, Q. Wei, X. Li, L. Huang, T. Zentgraf, ACS Nano (2020), 14(5), pp. 5553–5559

Zhou, Hongqiang, Basudeb Sain, Yongtian Wang, Christian Schlickriede, Ruizhe Zhao, Xue Zhang, Qunshuo Wei, Xiaowei Li, Lingling Huang, and Thomas Zentgraf. “Polarization-Encrypted Orbital Angular Momentum Multiplexed Metasurface Holography.” ACS Nano 14, no. 5 (2020): 5553–5559. https://doi.org/10.1021/acsnano.9b09814.


A dielectric metasurface optical chip for the generation of cold atoms

L. Zhu, X. Liu, B. Sain, M. Wang, C. Schlickriede, Y. Tang, J. Deng, K. Li, J. Yang, M. Holynski, S. Zhang, T. Zentgraf, K. Bongs, Y. Lien, G. Li, Science Advances (2020), 6(31), eabb6667

<jats:p>Compact and robust cold atom sources are increasingly important for quantum research, especially for transferring cutting-edge quantum science into practical applications. In this study, we report on a novel scheme that uses a metasurface optical chip to replace the conventional bulky optical elements used to produce a cold atomic ensemble with a single incident laser beam, which is split by the metasurface into multiple beams of the desired polarization states. Atom numbers ~10<jats:sup>7</jats:sup> and temperatures (about 35 μK) of relevance to quantum sensing are achieved in a compact and robust fashion. Our work highlights the substantial progress toward fully integrated cold atom quantum devices by exploiting metasurface optical chips, which may have great potential in quantum sensing, quantum computing, and other areas.</jats:p>

Zhu, Lingxiao, Xuan Liu, Basudeb Sain, Mengyao Wang, Christian Schlickriede, Yutao Tang, Junhong Deng, et al. “A Dielectric Metasurface Optical Chip for the Generation of Cold Atoms.” Science Advances 6, no. 31 (2020). https://doi.org/10.1126/sciadv.abb6667.


All-dielectric silicon metalens for two-dimensional particle manipulation in optical tweezers

T. Chantakit, C. Schlickriede, B. Sain, F. Meyer, T. Weiss, N. Chattham, T. Zentgraf, Photonics Research (2020), 8(9), pp. 1435-1440

Chantakit, Teanchai, Christian Schlickriede, Basudeb Sain, Fabian Meyer, Thomas Weiss, Nattaporn Chattham, and Thomas Zentgraf. “All-Dielectric Silicon Metalens for Two-Dimensional Particle Manipulation in Optical Tweezers.” Photonics Research 8, no. 9 (2020): 1435–40. https://doi.org/10.1364/prj.389200.


Nonlinear imaging with all-dielectric metasurfaces

C. Schlickriede, S.S. Kruk, L. Wang, B. Sain, Y. Kivshar, T. Zentgraf, Nano Letters (2020), 20(6), pp. 4370–4376

Schlickriede, Christian, Sergey S. Kruk, Lei Wang, Basudeb Sain, Yuri Kivshar, and Thomas Zentgraf. “Nonlinear Imaging with All-Dielectric Metasurfaces.” Nano Letters 20, no. 6 (2020): 4370–4376. https://doi.org/10.1021/acs.nanolett.0c01105.


All-optical switching of a dye-doped liquid crystal plasmonic metasurface

B. Atorf, H. Mühlenbernd, T. Zentgraf, H. Kitzerow, Optics Express (2020), 28(6), pp. 8898-8908

Atorf, Bernhard, Holger Mühlenbernd, Thomas Zentgraf, and Heinz Kitzerow. “All-Optical Switching of a Dye-Doped Liquid Crystal Plasmonic Metasurface.” Optics Express 28, no. 6 (2020): 8898–8908. https://doi.org/10.1364/oe.383877.


Nonlinear Wavefront Control by Geometric-Phase Dielectric Metasurfaces: Influence of Mode Field and Rotational Symmetry

B. Liu, B. Sain, B. Reineke, R. Zhao, C. Meier, L. Huang, Y. Jiang, T. Zentgraf, Advanced Optical Materials (2020), 8(9), 1902050

Nonlinear Pancharatnam–Berry phase metasurfaces facilitate the nontrivial phase modulation for frequency conversion processes by leveraging photon‐spin dependent nonlinear geometric‐phases. However, plasmonic metasurfaces show some severe limitation for nonlinear frequency conversion due to the intrinsic high ohmic loss and low damage threshold of plasmonic nanostructures. Here, the nonlinear geometric‐phases associated with the third‐harmonic generation process occurring in all‐dielectric metasurfaces is studied systematically, which are composed of silicon nanofins with different in‐plane rotational symmetries. It is found that the wave coupling among different field components of the resonant fundamental field gives rise to the appearance of different nonlinear geometric‐phases of the generated third‐harmonic signals. The experimental observations of the nonlinear beam steering and nonlinear holography realized in this work by all‐dielectric geometric‐phase metasurfaces are well explained with the developed theory. This work offers a new physical picture to understand the nonlinear optical process occurring at nanoscale dielectric resonators and will help in the design of nonlinear metasurfaces with tailored phase properties.

Liu, Bingyi, Basudeb Sain, Bernhard Reineke, Ruizhe Zhao, Cedrik Meier, Lingling Huang, Yongyuan Jiang, and Thomas Zentgraf. “Nonlinear Wavefront Control by Geometric-Phase Dielectric Metasurfaces: Influence of Mode Field and Rotational Symmetry.” Advanced Optical Materials 8, no. 9 (2020). https://doi.org/10.1002/adom.201902050.


Second harmonic imaging of plasmonic Pancharatnam-Berry phase metasurfaces coupled to monolayers of WS2

F. Spreyer, R. Zhao, L. Huang, T. Zentgraf, Nanophotonics (2020), 9(2), pp. 351–360

<jats:p>The nonlinear processes of frequency conversion such as second harmonic generation (SHG) usually obey certain selection rules, resulting from the preservation of different kinds of physical quantities, e.g. the angular momentum. For the SHG created by a monolayer of transition-metal dichalcogenides (TMDCs) such as WS<jats:sub>2</jats:sub>, the valley-exciton locked selection rule predicts an SHG signal in the cross-polarization state. By combining plasmonic nanostructures with a monolayer of TMDC, a hybrid metasurface is realized, which affects this nonlinear process because of an additional polarization conversion process. Here, we observe that the plasmonic metasurface modifies the light-matter interaction with the TMDC, resulting in an SHG signal that is co-polarized with respect to the incident field, which is usually forbidden for the monolayers of TMDC. We fabricate such hybrid metasurfaces by placing plasmonic nanorods on top of a monolayer WS<jats:sub>2</jats:sub> and study the valley-exciton locked SHG emission from such system for different parameters, such as wavelength and polarization. Furthermore, we show the potential of the hybrid metasurface for tailoring nonlinear processes by adding additional phase information to the SHG signal using the Pancharatnam-Berry phase effect. This allows direct tailoring of the SHG emission to the far-field.</jats:p>

Spreyer, Florian, Ruizhe Zhao, Lingling Huang, and Thomas Zentgraf. “Second Harmonic Imaging of Plasmonic Pancharatnam-Berry Phase Metasurfaces Coupled to Monolayers of WS2.” Nanophotonics 9, no. 2 (2020): 351–360. https://doi.org/10.1515/nanoph-2019-0378.


2019

Metasurface interferometry toward quantum sensors

P. Georgi, M. Massaro, K.H. Luo, B. Sain, N. Montaut, H. Herrmann, T. Weiss, G. Li, C. Silberhorn, T. Zentgraf, Light: Science & Applications (2019), 8, pp. 70

Georgi, Philip, Marcello Massaro, Kai Hong Luo, Basudeb Sain, Nicola Montaut, Harald Herrmann, Thomas Weiss, Guixin Li, Christine Silberhorn, and Thomas Zentgraf. “Metasurface Interferometry toward Quantum Sensors.” Light: Science & Applications 8 (2019): 70. https://doi.org/10.1038/s41377-019-0182-6.


Reconfigurable metasurface hologram by utilizing addressable dynamic pixels

T. Li, Q. Wei, B. Reineke, F. Walter, Y. Wang, T. Zentgraf, L. Huang, Optics Express (2019), 27(15), pp. 21153-21162

Li, Tianyou, Qunshuo Wei, Bernhard Reineke, Felicitas Walter, Yongtian Wang, Thomas Zentgraf, and Lingling Huang. “Reconfigurable Metasurface Hologram by Utilizing Addressable Dynamic Pixels.” Optics Express 27, no. 15 (2019): 21153–62. https://doi.org/10.1364/oe.27.021153.


Dynamic control of mode modulation and spatial multiplexing using hybrid metasurfaces

Z. Lin, L. Huang, R. Zhao, Q. Wei, T. Zentgraf, Y. Wang, X. Li, Optics Express (2019), 27(13), pp. 18740-18750

Lin, Zemeng, Lingling Huang, Ruizhe Zhao, Qunshuo Wei, Thomas Zentgraf, Yongtian Wang, and Xiaowei Li. “Dynamic Control of Mode Modulation and Spatial Multiplexing Using Hybrid Metasurfaces.” Optics Express 27, no. 13 (2019): 18740–50. https://doi.org/10.1364/oe.27.018740.


Nonlinear optics in all-dielectric nanoantennas and metasurfaces: a review

B. Sain, C. Meier, T. Zentgraf, Advanced Photonics (2019), 1(2), pp. 024002

Free from phase-matching constraints, plasmonic metasurfaces have contributed significantly to the control of optical nonlinearity and enhancement of nonlinear generation efficiency by engineering subwavelength meta-atoms. However, high dissipative losses and inevitable thermal heating limit their applicability in nonlinear nanophotonics. All-dielectric metasurfaces, supporting both electric and magnetic Mie-type resonances in their nanostructures, have appeared as a promising alternative to nonlinear plasmonics. High-index dielectric nanostructures, allowing additional magnetic resonances, can induce magnetic nonlinear effects, which, along with electric nonlinearities, increase the nonlinear conversion efficiency. In addition, low dissipative losses and high damage thresholds provide an extra degree of freedom for operating at high pump intensities, resulting in a considerable enhancement of the nonlinear processes. We discuss the current state of the art in the intensely developing area of all-dielectric nonlinear nanostructures and metasurfaces, including the role of Mie modes, Fano resonances, and anapole moments for harmonic generation, wave mixing, and ultrafast optical switching. Furthermore, we review the recent progress in the nonlinear phase and wavefront control using all-dielectric metasurfaces. We discuss techniques to realize all-dielectric metasurfaces for multifunctional applications and generation of second-order nonlinear processes from complementary metal–oxide–semiconductor-compatible materials.

Sain, Basudeb, Cedrik Meier, and Thomas Zentgraf. “Nonlinear Optics in All-Dielectric Nanoantennas and Metasurfaces: A Review.” Advanced Photonics 1, no. 2 (2019): 024002. https://doi.org/10.1117/1.ap.1.2.024002.


Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors

S. Suwannasopon, F. Meyer, C. Schlickriede, P. Chaisakul, J. T-Thienprasert, J. Limtrakul, T. Zentgraf, N. Chattham, Crystals (2019), 9(10), pp. 515

<jats:p>Surfaces covered with layers of ultrathin nanoantenna structures—so called metasurfaces have recently been proven capable of completely controlling phase of light. Metalenses have emerged from the advance in the development of metasurfaces providing a new basis for recasting traditional lenses into thin, planar optical components capable of focusing light. The lens made of arrays of plasmonic gold nanorods were fabricated on a glass substrate by using electron beam lithography. A 1064 nm laser was used to create a high intensity circularly polarized light focal spot through metalens of focal length 800 µm, N.A. = 0.6 fabricated based on Pancharatnam-Berry phase principle. We demonstrated that optical rotation of birefringent nematic liquid crystal droplets trapped in the laser beam was possible through this metalens. The rotation of birefringent droplets convinced that the optical trap possesses strong enough angular momentum of light from radiation of each nanostructure acting like a local half waveplate and introducing an orientation-dependent phase to light. Here, we show the success in creating a miniaturized and robust metalens based optical tweezers system capable of rotating liquid crystals droplets to imitate an optical motor for future lab-on-a-chip applications.</jats:p>

Suwannasopon, Satayu, Fabian Meyer, Christian Schlickriede, Papichaya Chaisakul, Jiraroj T-Thienprasert, Jumras Limtrakul, Thomas Zentgraf, and Nattaporn Chattham. “Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors.” Crystals 9, no. 10 (2019): 515. https://doi.org/10.3390/cryst9100515.


Silicon metasurfaces for third harmonic geometric phase manipulation and multiplexed holography

B. Reineke, B. Sain, R. Zhao, L. Carletti, B. Liu, L. Huang, C. de Angelis, T. Zentgraf, Nano Letters (2019), 19(9), pp. 6585–6591

Reineke, Bernhard, Basudeb Sain, Ruizhe Zhao, Luca Carletti, Bingyi Liu, Lingling Huang, Costantino de Angelis, and Thomas Zentgraf. “Silicon Metasurfaces for Third Harmonic Geometric Phase Manipulation and Multiplexed Holography.” Nano Letters 19, no. 9 (2019): 6585–6591. https://doi.org/10.1021/acs.nanolett.9b02844.


Four‐Wave Mixing Holographic Multiplexing Based on Nonlinear Metasurfaces

Z. Lin, L. Huang, Z.T. Xu, X. Li, T. Zentgraf, Y. Wang, Advanced Optical Materials (2019), 7(21), pp. 1900782

Lin, Zemeng, Lingling Huang, Zhen Tao Xu, Xiaowei Li, Thomas Zentgraf, and Yongtian Wang. “Four‐Wave Mixing Holographic Multiplexing Based on Nonlinear Metasurfaces.” Advanced Optical Materials 7, no. 21 (2019): 1900782. https://doi.org/10.1002/adom.201900782.


Simultaneous Spectral and Spatial Modulation for Color Printing and Holography Using All-dielectric Metasurfaces

Q. Wei, B. Sain, Y. Wang, B. Reineke, X. Li, L. Huang, T. Zentgraf, Nano Letters (2019), 19(12), pp. 8964–8971

Wei, Qunshuo, Basudeb Sain, Yongtian Wang, Bernhard Reineke, Xiaowei Li, Lingling Huang, and Thomas Zentgraf. “Simultaneous Spectral and Spatial Modulation for Color Printing and Holography Using All-Dielectric Metasurfaces.” Nano Letters 19, no. 12 (2019): 8964–8971. https://doi.org/10.1021/acs.nanolett.9b03957.


Strong nonlinear optical response from ZnO by coupled and lattice-matched nanoantennas

M. Protte, N. Weber, C. Golla, T. Zentgraf, C. Meier, Journal of Applied Physics (2019), 125, 193104

Protte, Maximilian, Nils Weber, Christian Golla, Thomas Zentgraf, and Cedrik Meier. “Strong Nonlinear Optical Response from ZnO by Coupled and Lattice-Matched Nanoantennas.” Journal of Applied Physics 125 (2019). https://doi.org/10.1063/1.5093257.


Strong Nonlinear Optical Activity Induced by Lattice Surface Modes on Plasmonic Metasurface

S. Chen, B. Reineke, G. Li, T. Zentgraf, S. Zhang, Nano Letters (2019), 19(9), pp. 6278-6283

Chen, Shumei, Bernhard Reineke, Guixin Li, Thomas Zentgraf, and Shuang Zhang. “Strong Nonlinear Optical Activity Induced by Lattice Surface Modes on Plasmonic Metasurface.” Nano Letters 19, no. 9 (2019): 6278–83. https://doi.org/10.1021/acs.nanolett.9b02417.


Nonreciprocal Asymmetric Polarization Encryption by Layered Plasmonic Metasurfaces

D. Frese, Q. Wei, Y. Wang, L. Huang, T. Zentgraf, Nano Letters (2019), 19(6), pp. 3976-3980

As flexible optical devices that can manipulate the phase and amplitude of light, metasurfaces would clearly benefit from directional optical properties. However, single layer metasurface systems consisting of two-dimensional nanoparticle arrays exhibit only a weak spatial asymmetry perpendicular to the surface and therefore have mostly symmetric transmission features. Here, we present a metasurface design principle for nonreciprocal polarization encryption of holographic images. Our approach is based on a two-layer plasmonic metasurface design that introduces a local asymmetry and generates a bidirectional functionality with full phase and amplitude control of the transmitted light. The encoded hologram is designed to appear in a particular linear cross-polarization channel, while it is disappearing in the reverse propagation direction. Hence, layered metasurface systems can feature asymmetric transmission with full phase and amplitude control and therefore expand the design freedom in nanoscale optical devices toward asymmetric information processing and security features for anticounterfeiting applications.

Frese, Daniel, Qunshuo Wei, Yongtian Wang, Lingling Huang, and Thomas Zentgraf. “Nonreciprocal Asymmetric Polarization Encryption by Layered Plasmonic Metasurfaces.” Nano Letters 19, no. 6 (2019): 3976–80. https://doi.org/10.1021/acs.nanolett.9b01298.


2018

Imaging through Nonlinear Metalens Using Second Harmonic Generation

C. Schlickriede, N. Waterman, B. Reineke, P. Georgi, G. Li, S. Zhang, T. Zentgraf, Advanced Materials (2018), 30(8), 1703843

Schlickriede, Christian, Naomi Waterman, Bernhard Reineke, Philip Georgi, Guixin Li, Shuang Zhang, and Thomas Zentgraf. “Imaging through Nonlinear Metalens Using Second Harmonic Generation.” Advanced Materials 30, no. 8 (2018). https://doi.org/10.1002/adma.201703843.


Spin and Geometric Phase Control Four-Wave Mixing from Metasurfaces

G. Li, G. Sartorello, S. Chen, L.H. Nicholls, K.F. Li, T. Zentgraf, S. Zhang, A.V. Zayats, Laser & Photonics Reviews (2018), 12(6), 1800034

Li, Guixin, Giovanni Sartorello, Shumei Chen, Luke H. Nicholls, King Fai Li, Thomas Zentgraf, Shuang Zhang, and Anatoly V. Zayats. “Spin and Geometric Phase Control Four-Wave Mixing from Metasurfaces.” Laser & Photonics Reviews 12, no. 6 (2018). https://doi.org/10.1002/lpor.201800034.


Multichannel vectorial holographic display and encryption

R. Zhao, B. Sain, Q. Wei, C. Tang, X. Li, T. Weiss, L. Huang, Y. Wang, T. Zentgraf, Light: Science & Applications (2018), 7(1)

Zhao, Ruizhe, Basudeb Sain, Qunshuo Wei, Chengchun Tang, Xiaowei Li, Thomas Weiss, Lingling Huang, Yongtian Wang, and Thomas Zentgraf. “Multichannel Vectorial Holographic Display and Encryption.” Light: Science & Applications 7, no. 1 (2018). https://doi.org/10.1038/s41377-018-0091-0.


Selective Diffraction with Complex Amplitude Modulation by Dielectric Metasurfaces

X. Song, L. Huang, C. Tang, J. Li, X. Li, J. Liu, Y. Wang, T. Zentgraf, Advanced Optical Materials (2018), 6(4), 1701181

Song, Xu, Lingling Huang, Chengchun Tang, Junjie Li, Xiaowei Li, Juan Liu, Yongtian Wang, and Thomas Zentgraf. “Selective Diffraction with Complex Amplitude Modulation by Dielectric Metasurfaces.” Advanced Optical Materials 6, no. 4 (2018). https://doi.org/10.1002/adom.201701181.


Editorial for the theories and applications of metasurfaces

Z. Guo, X. Chen, T. Zentgraf, Journal of Physics D: Applied Physics (2018), 51(15), 150201

Guo, Zhongyi, Xianzhong Chen, and Thomas Zentgraf. “Editorial for the Theories and Applications of Metasurfaces.” Journal of Physics D: Applied Physics 51, no. 15 (2018). https://doi.org/10.1088/1361-6463/aab3b6.


Nonlinear Quasi-Phase Matching with metasurfaces

S. Heron, B. Reineke, S. Vezian, T. Zentgraf, B. Damilano, P. Genevet, in: 2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials), IEEE, 2018

Heron, S., B. Reineke, S. Vezian, Thomas Zentgraf, B. Damilano, and P. Genevet. “Nonlinear Quasi-Phase Matching with Metasurfaces.” In 2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials). IEEE, 2018. https://doi.org/10.1109/metamaterials.2018.8534176.


Tailored UV Emission by Nonlinear IR Excitation from ZnO Photonic Crystal Nanocavities

S.P. Hoffmann, M. Albert, N. Weber, D. Sievers, J. Förstner, T. Zentgraf, C. Meier, ACS Photonics (2018), 5, pp. 1933-1942

Hoffmann, Sandro P., Maximilian Albert, Nils Weber, Denis Sievers, Jens Förstner, Thomas Zentgraf, and Cedrik Meier. “Tailored UV Emission by Nonlinear IR Excitation from ZnO Photonic Crystal Nanocavities.” ACS Photonics 5 (2018): 1933–42. https://doi.org/10.1021/acsphotonics.7b01228.


Switchable Plasmonic Holograms Utilizing the Electro-Optic Effect of a Liquid-Crystal Circular Polarizer

B. Atorf, H. Rasouli, H. Mühlenbernd, B.J. Reineke, T. Zentgraf, H. Kitzerow, The Journal of Physical Chemistry C (2018), 122(8), pp. 4600-4606

Atorf, Bernhard, Hoda Rasouli, Holger Mühlenbernd, Bernhard J. Reineke, Thomas Zentgraf, and Heinz Kitzerow. “Switchable Plasmonic Holograms Utilizing the Electro-Optic Effect of a Liquid-Crystal Circular Polarizer.” The Journal of Physical Chemistry C 122, no. 8 (2018): 4600–4606. https://doi.org/10.1021/acs.jpcc.7b12609.


Controlling the phase of optical nonlinearity with plasmonic metasurfaces

S. Chen, G. Li, K.W. Cheah, T. Zentgraf, S. Zhang, Nanophotonics (2018), 7(6), pp. 1013-1024

Chen, Shumei, Guixin Li, Kok Wai Cheah, Thomas Zentgraf, and Shuang Zhang. “Controlling the Phase of Optical Nonlinearity with Plasmonic Metasurfaces.” Nanophotonics 7, no. 6 (2018): 1013–24. https://doi.org/10.1515/nanoph-2018-0011.


Efficient frequency conversion by combined photonic–plasmonic mode coupling

N. Weber, S.P. Hoffmann, M. Albert, T. Zentgraf, C. Meier, Journal of Applied Physics (2018), 123(10), 103101

Weber, N., S. P. Hoffmann, M. Albert, Thomas Zentgraf, and Cedrik Meier. “Efficient Frequency Conversion by Combined Photonic–Plasmonic Mode Coupling.” Journal of Applied Physics 123, no. 10 (2018). https://doi.org/10.1063/1.5017010.


Nanoscale Polarization Manipulation and Encryption Based on Dielectric Metasurfaces

R. Zhao, L. Huang, C. Tang, J. Li, X. Li, Y. Wang, T. Zentgraf, Advanced Optical Materials (2018), 1800490

Zhao, Ruizhe, Lingling Huang, Chengchun Tang, Junjie Li, Xiaowei Li, Yongtian Wang, and Thomas Zentgraf. “Nanoscale Polarization Manipulation and Encryption Based on Dielectric Metasurfaces.” Advanced Optical Materials, 2018. https://doi.org/10.1002/adom.201800490.


Near-field plasmonic beam engineering by complex amplitude modulation based on metasurface (Conference Presentation)

L. Sun, X. Zhang, R. Zhao, X. Li, J. Wang, B. Bai, Y. Wang, T. Zentgraf, L. Huang, X. Song, in: Nanophotonics VII, SPIE, 2018

Sun, Lin, Xiaomeng Zhang, Ruizhe Zhao, Xiaowei Li, Jia Wang, Benfeng Bai, Yongtian Wang, Thomas Zentgraf, Lingling Huang, and Xu Song. “Near-Field Plasmonic Beam Engineering by Complex Amplitude Modulation Based on Metasurface (Conference Presentation).” In Nanophotonics VII, edited by David L. Andrews, Jean-Michel Nunzi, Andreas Ostendorf, and Angus J. Bain. SPIE, 2018. https://doi.org/10.1117/12.2303819.


Metasurface holography: from fundamentals to applications

L. Huang, S. Zhang, T. Zentgraf, Nanophotonics (2018), 7(6), pp. 1169-1190

Huang, Lingling, Shuang Zhang, and Thomas Zentgraf. “Metasurface Holography: From Fundamentals to Applications.” Nanophotonics 7, no. 6 (2018): 1169–90. https://doi.org/10.1515/nanoph-2017-0118.


Imaging the rainbow

T. Zentgraf, Nature Nanotechnology (2018), 13(3), pp. 179-180

Zentgraf, Thomas. “Imaging the Rainbow.” Nature Nanotechnology 13, no. 3 (2018): 179–80. https://doi.org/10.1038/s41565-018-0062-x.


Third Harmonic Generation Enhanced by Multipolar Interference in Complementary Silicon Metasurfaces

S. Chen, M. Rahmani, K.F. Li, A. Miroshnichenko, T. Zentgraf, G. Li, D. Neshev, S. Zhang, ACS Photonics (2018), 5(5), pp. 1671-1675

Chen, Shumei, Mohsen Rahmani, King Fai Li, Andrey Miroshnichenko, Thomas Zentgraf, Guixin Li, Dragomir Neshev, and Shuang Zhang. “Third Harmonic Generation Enhanced by Multipolar Interference in Complementary Silicon Metasurfaces.” ACS Photonics 5, no. 5 (2018): 1671–75. https://doi.org/10.1021/acsphotonics.7b01423.


Switchable Plasmonic Metasurface Utilizing the Electro-Optic Kerr Effect of a Blue Phase Liquid Crystal

B. Atorf, S. Friesen, R. Rennerich, H. Mühlenbernd, T. Zentgraf, H. Kitzerow, Polymer Science, Series C (2018), 60, pp. 55-62

Atorf, Bernhard, Simon Friesen, Roman Rennerich, Holger Mühlenbernd, Thomas Zentgraf, and Heinz Kitzerow. “Switchable Plasmonic Metasurface Utilizing the Electro-Optic Kerr Effect of a Blue Phase Liquid Crystal.” Polymer Science, Series C 60 (2018): 55–62. https://doi.org/10.1134/s1811238218010010.


2017

Beam switching and bifocal zoom lensing using active plasmonic metasurfaces

X. Yin, T. Steinle, L. Huang, T. Taubner, M. Wuttig, T. Zentgraf, H. Giessen, Light: Science & Applications (2017), 6(7), e17016

Yin, Xinghui, Tobias Steinle, Lingling Huang, Thomas Taubner, Matthias Wuttig, Thomas Zentgraf, and Harald Giessen. “Beam Switching and Bifocal Zoom Lensing Using Active Plasmonic Metasurfaces.” Light: Science & Applications 6, no. 7 (2017). https://doi.org/10.1038/lsa.2017.16.


Manipulation of vector beam polarization with geometric metasurfaces

Q. Guo, C. Schlickriede, D. Wang, H. Liu, Y. Xiang, T. Zentgraf, S. Zhang, Optics Express (2017), 25(13), 14300

Guo, Qinghua, Christian Schlickriede, Dongyang Wang, Hongchao Liu, Yuanjiang Xiang, Thomas Zentgraf, and Shuang Zhang. “Manipulation of Vector Beam Polarization with Geometric Metasurfaces.” Optics Express 25, no. 13 (2017). https://doi.org/10.1364/oe.25.014300.


Volumetric Generation of Optical Vortices with Metasurfaces

L. Huang, X. Song, B. Reineke, T. Li, X. Li, J. Liu, S. Zhang, Y. Wang, T. Zentgraf, ACS Photonics (2017), pp. 338-346

Huang, Lingling, Xu Song, Bernhard Reineke, Tianyou Li, Xiaowei Li, Juan Liu, Shuang Zhang, Yongtian Wang, and Thomas Zentgraf. “Volumetric Generation of Optical Vortices with Metasurfaces.” ACS Photonics, 2017, 338–46. https://doi.org/10.1021/acsphotonics.6b00808.


Double resonant plasmonic nanoantennas for efficient second harmonic generation in zinc oxide

N. Weber, M. Protte, F. Walter, P. Georgi, T. Zentgraf, C. Meier, Physical Review B (2017), 95(20)

Weber, Nils, Maximilian Protte, Felicitas Walter, Philip Georgi, Thomas Zentgraf, and Cedrik Meier. “Double Resonant Plasmonic Nanoantennas for Efficient Second Harmonic Generation in Zinc Oxide.” Physical Review B 95, no. 20 (2017). https://doi.org/10.1103/physrevb.95.205307.


Nonlinear Metasurface for Simultaneous Control of Spin and Orbital Angular Momentum in Second Harmonic Generation

G. Li, L. Wu, K.F. Li, S. Chen, C. Schlickriede, Z. Xu, S. Huang, W. Li, Y. Liu, E.Y.B. Pun, T. Zentgraf, K.W. Cheah, Y. Luo, S. Zhang, Nano Letters (2017), 17(12), pp. 7974-7979

Li, Guixin, Lin Wu, King F. Li, Shumei Chen, Christian Schlickriede, Zhengji Xu, Siya Huang, et al. “Nonlinear Metasurface for Simultaneous Control of Spin and Orbital Angular Momentum in Second Harmonic Generation.” Nano Letters 17, no. 12 (2017): 7974–79. https://doi.org/10.1021/acs.nanolett.7b04451.


Nonlinear photonic metasurfaces

G. Li, S. Zhang, T. Zentgraf, Nature Reviews Materials (2017), 2(5), 17010

Li, Guixin, Shuang Zhang, and Thomas Zentgraf. “Nonlinear Photonic Metasurfaces.” Nature Reviews Materials 2, no. 5 (2017). https://doi.org/10.1038/natrevmats.2017.10.


Single-pixel computational ghost imaging with helicity-dependent metasurface hologram

H. Liu, B. Yang, Q. Guo, J. Shi, C. Guan, G. Zheng, H. Mühlenbernd, G. Li, T. Zentgraf, S. Zhang, Science Advances (2017), 3(9), e1701477

Liu, Hong-Chao, Biao Yang, Qinghua Guo, Jinhui Shi, Chunying Guan, Guoxing Zheng, Holger Mühlenbernd, Guixin Li, Thomas Zentgraf, and Shuang Zhang. “Single-Pixel Computational Ghost Imaging with Helicity-Dependent Metasurface Hologram.” Science Advances 3, no. 9 (2017). https://doi.org/10.1126/sciadv.1701477.


Ultrathin Nonlinear Metasurface for Optical Image Encoding

F. Walter, G. Li, C. Meier, S. Zhang, T. Zentgraf, Nano Letters (2017), 17(5), pp. 3171-3175

Walter, Felicitas, Guixin Li, Cedrik Meier, Shuang Zhang, and Thomas Zentgraf. “Ultrathin Nonlinear Metasurface for Optical Image Encoding.” Nano Letters 17, no. 5 (2017): 3171–75. https://doi.org/10.1021/acs.nanolett.7b00676.


Optimisation of stability and charge transferability of ferrocene-encapsulated carbon nanotubes

P. Prajongtat, S. Sriyab, T. Zentgraf, S. Hannongbua, Molecular Physics (2017), 116(1), pp. 9-18

Prajongtat, Pongthep, Suwannee Sriyab, Thomas Zentgraf, and Supa Hannongbua. “Optimisation of Stability and Charge Transferability of Ferrocene-Encapsulated Carbon Nanotubes.” Molecular Physics 116, no. 1 (2017): 9–18. https://doi.org/10.1080/00268976.2017.1359348.


Rotational Doppler shift induced by spin-orbit coupling of light at spinning metasurfaces

P. Georgi, C. Schlickriede, G. Li, S. Zhang, T. Zentgraf, Optica (2017), 4(8), 1000

Georgi, Philip, Christian Schlickriede, Guixin Li, Shuang Zhang, and Thomas Zentgraf. “Rotational Doppler Shift Induced by Spin-Orbit Coupling of Light at Spinning Metasurfaces.” Optica 4, no. 8 (2017). https://doi.org/10.1364/optica.4.001000.


Directional Emission from Dielectric Leaky-Wave Nanoantennas

M. Peter, A. Hildebrandt, C. Schlickriede, K. Gharib, T. Zentgraf, J. Förstner, S. Linden, Nano Letters (2017), 17(7), pp. 4178-4183

Peter, Manuel, Andre Hildebrandt, Christian Schlickriede, Kimia Gharib, Thomas Zentgraf, Jens Förstner, and Stefan Linden. “Directional Emission from Dielectric Leaky-Wave Nanoantennas.” Nano Letters 17, no. 7 (2017): 4178–83. https://doi.org/10.1021/acs.nanolett.7b00966.


2016

Rotational Doppler effect in nonlinear optics

G. Li, T. Zentgraf, S. Zhang, Nature Physics (2016), 12(8), pp. 736-740

Li, Guixin, Thomas Zentgraf, and Shuang Zhang. “Rotational Doppler Effect in Nonlinear Optics.” Nature Physics 12, no. 8 (2016): 736–40. https://doi.org/10.1038/nphys3699.


Designermaterialien für nichtlineare Optik

H. Probst, T. Zentgraf, Physik in unserer Zeit (2016), 47(2), pp. 84-89

Probst, Heike, and Thomas Zentgraf. “Designermaterialien Für Nichtlineare Optik.” Physik in Unserer Zeit 47, no. 2 (2016): 84–89. https://doi.org/10.1002/piuz.201601427.


Helicity-Preserving Omnidirectional Plasmonic Mirror

S. Xiao, H. Mühlenbernd, G. Li, M. Kenney, F. Liu, T. Zentgraf, S. Zhang, J. Li, Advanced Optical Materials (2016), 4(5), pp. 654-658

Xiao, Shiyi, Holger Mühlenbernd, Guixin Li, Mitchell Kenney, Fu Liu, Thomas Zentgraf, Shuang Zhang, and Jensen Li. “Helicity-Preserving Omnidirectional Plasmonic Mirror.” Advanced Optical Materials 4, no. 5 (2016): 654–58. https://doi.org/10.1002/adom.201500705.


Giant Nonlinear Optical Activity of Achiral Origin in Planar Metasurfaces with Quadratic and Cubic Nonlinearities

S. Chen, F. Zeuner, M. Weismann, B. Reineke, G. Li, V.K. Valev, K.W. Cheah, N.C. Panoiu, T. Zentgraf, S. Zhang, Advanced Materials (2016), 28(15), pp. 2992-2999

Chen, Shumei, Franziska Zeuner, Martin Weismann, Bernhard Reineke, Guixin Li, Ventsislav Kolev Valev, Kok Wai Cheah, Nicolae Coriolan Panoiu, Thomas Zentgraf, and Shuang Zhang. “Giant Nonlinear Optical Activity of Achiral Origin in Planar Metasurfaces with Quadratic and Cubic Nonlinearities.” Advanced Materials 28, no. 15 (2016): 2992–99. https://doi.org/10.1002/adma.201505640.


Simulations of high harmonic generation from plasmonic nanoparticles in the terahertz region

Y. Grynko, T. Zentgraf, T. Meier, J. Förstner, Applied Physics B (2016), 122(9), pp. 242

Grynko, Yevgen, Thomas Zentgraf, Torsten Meier, and Jens Förstner. “Simulations of High Harmonic Generation from Plasmonic Nanoparticles in the Terahertz Region.” Applied Physics B 122, no. 9 (2016): 242. https://doi.org/10.1007/s00340-016-6510-0.


Doppler-Effekt für rotierende Objekte

T. Zentgraf, Physik in unserer Zeit (2016), 47(4), pp. 163-164

Zentgraf, Thomas. “Doppler-Effekt Für Rotierende Objekte.” Physik in Unserer Zeit 47, no. 4 (2016): 163–64. https://doi.org/10.1002/piuz.201690063.


Spin and wavelength multiplexed nonlinear metasurface holography

W. Ye, F. Zeuner, X. Li, B. Reineke, S. He, C. Qiu, J. Liu, Y. Wang, S. Zhang, T. Zentgraf, Nature Communications (2016), 7, 11930

Ye, Weimin, Franziska Zeuner, Xin Li, Bernhard Reineke, Shan He, Cheng-Wei Qiu, Juan Liu, Yongtian Wang, Shuang Zhang, and Thomas Zentgraf. “Spin and Wavelength Multiplexed Nonlinear Metasurface Holography.” Nature Communications 7 (2016). https://doi.org/10.1038/ncomms11930.


2015

Metasurface holograms reaching 80% efficiency

G. Zheng, H. Mühlenbernd, M. Kenney, G. Li, T. Zentgraf, S. Zhang, Nature Nanotechnology (2015), 10(4), pp. 308-312

Zheng, Guoxing, Holger Mühlenbernd, Mitchell Kenney, Guixin Li, Thomas Zentgraf, and Shuang Zhang. “Metasurface Holograms Reaching 80% Efficiency.” Nature Nanotechnology 10, no. 4 (2015): 308–12. https://doi.org/10.1038/nnano.2015.2.


Coupling Mediated Coherent Control of Localized Surface Plasmon Polaritons

F. Zeuner, M. Muldarisnur, A. Hildebrandt, J. Förstner, T. Zentgraf, Nano Letters (2015), 15(6), pp. 4189-4193

Zeuner, Franziska, Mulda Muldarisnur, Andre Hildebrandt, Jens Förstner, and Thomas Zentgraf. “Coupling Mediated Coherent Control of Localized Surface Plasmon Polaritons.” Nano Letters 15, no. 6 (2015): 4189–93. https://doi.org/10.1021/acs.nanolett.5b01381.


Broadband Hybrid Holographic Multiplexing with Geometric Metasurfaces

L. Huang, H. Mühlenbernd, X. Li, X. Song, B. Bai, Y. Wang, T. Zentgraf, Advanced Materials (2015), 27(41), pp. 6444-6449

Huang, Lingling, Holger Mühlenbernd, Xiaowei Li, Xu Song, Benfeng Bai, Yongtian Wang, and Thomas Zentgraf. “Broadband Hybrid Holographic Multiplexing with Geometric Metasurfaces.” Advanced Materials 27, no. 41 (2015): 6444–49. https://doi.org/10.1002/adma.201502541.


Amplitude- and Phase-Controlled Surface Plasmon Polariton Excitation with Metasurfaces

H. Mühlenbernd, P. Georgi, N. Pholchai, L. Huang, G. Li, S. Zhang, T. Zentgraf, ACS Photonics (2015), 3(1), pp. 124-129

Mühlenbernd, Holger, Philip Georgi, Nitipat Pholchai, Lingling Huang, Guixin Li, Shuang Zhang, and Thomas Zentgraf. “Amplitude- and Phase-Controlled Surface Plasmon Polariton Excitation with Metasurfaces.” ACS Photonics 3, no. 1 (2015): 124–29. https://doi.org/10.1021/acsphotonics.5b00536.


Continuous control of the nonlinearity phase for harmonic generations

G. Li, S. Chen, N. Pholchai, B. Reineke, P.W.H. Wong, E.B. Pun, K.W. Cheah, T. Zentgraf, S. Zhang, Nature Materials (2015), 14(6), pp. 607-612

Li, Guixin, Shumei Chen, Nitipat Pholchai, Bernhard Reineke, Polis Wing Han Wong, Edwin Yue Bun Pun, Kok Wai Cheah, Thomas Zentgraf, and Shuang Zhang. “Continuous Control of the Nonlinearity Phase for Harmonic Generations.” Nature Materials 14, no. 6 (2015): 607–12. https://doi.org/10.1038/nmat4267.


Nonlinear optical sub-bandgap excitation of ZnO-based photonic resonators

C.A. Bader, F. Zeuner, M.H.W. Bader, T. Zentgraf, C. Meier, Journal of Applied Physics (2015), 118(21), 213105

Bader, Christina A., Franziska Zeuner, Manuel H. W. Bader, Thomas Zentgraf, and Cedrik Meier. “Nonlinear Optical Sub-Bandgap Excitation of ZnO-Based Photonic Resonators.” Journal of Applied Physics 118, no. 21 (2015). https://doi.org/10.1063/1.4936768.


2014

Effect of Alignment on a Liquid Crystal/Split-Ring Resonator Metasurface

B. Atorf, H. Mühlenbernd, M. Muldarisnur, T. Zentgraf, H. Kitzerow, ChemPhysChem (2014), 15(7), pp. 1470-1476

Atorf, Bernhard, Holger Mühlenbernd, Mulda Muldarisnur, Thomas Zentgraf, and Heinz Kitzerow. “Effect of Alignment on a Liquid Crystal/Split-Ring Resonator Metasurface.” ChemPhysChem 15, no. 7 (2014): 1470–76. https://doi.org/10.1002/cphc.201301069.


Symmetry-Selective Third-Harmonic Generation from Plasmonic Metacrystals

S. Chen, G. Li, F. Zeuner, W.H. Wong, E.Y.B. Pun, T. Zentgraf, K.W. Cheah, S. Zhang, Physical Review Letters (2014), 113(3)

Chen, Shumei, Guixin Li, Franziska Zeuner, Wing Han Wong, Edwin Yue Bun Pun, Thomas Zentgraf, Kok Wai Cheah, and Shuang Zhang. “Symmetry-Selective Third-Harmonic Generation from Plasmonic Metacrystals.” Physical Review Letters 113, no. 3 (2014). https://doi.org/10.1103/physrevlett.113.033901.


Manipulating wave propagation with geometric metasurfaces: fundamentals and applications

L. Huang, X. Chen, B. Bai, Q. Tan, G. Jin, T. Zentgraf, S. Zhang, in: Plasmonics, SPIE, 2014

Huang, Lingling, Xianzhong Chen, Benfeng Bai, Qiaofeng Tan, Guofan Jin, Thomas Zentgraf, and Shuang Zhang. “Manipulating Wave Propagation with Geometric Metasurfaces: Fundamentals and Applications.” In Plasmonics, edited by Xing Zhu, Satoshi Kawata, David J. Bergman, Peter Nordlander, and Francisco Javier García de Abajo. SPIE, 2014. https://doi.org/10.1117/12.2071744.


Hochauflösende Holografie

T. Zentgraf, Physik in unserer Zeit (2014), 45(2), pp. 58-59

Zentgraf, Thomas. “Hochauflösende Holografie.” Physik in Unserer Zeit 45, no. 2 (2014): 58–59. https://doi.org/10.1002/piuz.201490026.


Electro-optic tuning of split ring resonators embedded in a liquid crystal

B. Atorf, H. Mühlenbernd, M. Muldarisnur, T. Zentgraf, H. Kitzerow, Optics Letters (2014), 39(5), 1129

Atorf, Bernhard, Holger Mühlenbernd, Mulda Muldarisnur, Thomas Zentgraf, and Heinz Kitzerow. “Electro-Optic Tuning of Split Ring Resonators Embedded in a Liquid Crystal.” Optics Letters 39, no. 5 (2014). https://doi.org/10.1364/ol.39.001129.


Ag‐nanoparticles in PA-templates

A. Ezhova, J. Lindner, M. Muldarisnur, T. Zentgraf, K. Huber, 2014

Ezhova, A., Jörg Lindner, M. Muldarisnur, Thomas Zentgraf, and K. Huber. “Ag‐nanoparticles in PA-Templates,” 2014.


2013

Blue-green emitting microdisks using low-temperature-grown ZnO on patterned silicon substrates

M. Ruth, T. Zentgraf, C. Meier, Optics Express (2013), 21(21), 25517

Ruth, Marcel, Thomas Zentgraf, and Cedrik Meier. “Blue-Green Emitting Microdisks Using Low-Temperature-Grown ZnO on Patterned Silicon Substrates.” Optics Express 21, no. 21 (2013). https://doi.org/10.1364/oe.21.025517.


Interference-induced asymmetric transmission through a monolayer of anisotropic chiral metamolecules

S. Zhang, F. Liu, T. Zentgraf, J. Li, Physical Review A (2013), 88(2)

Zhang, Shuang, Fu Liu, Thomas Zentgraf, and Jensen Li. “Interference-Induced Asymmetric Transmission through a Monolayer of Anisotropic Chiral Metamolecules.” Physical Review A 88, no. 2 (2013). https://doi.org/10.1103/physreva.88.023823.


Three-dimensional optical holography using a plasmonic metasurface

L. Huang, X. Chen, H. Mühlenbernd, H. Zhang, S. Chen, B. Bai, Q. Tan, G. Jin, K. Cheah, C. Qiu, J. Li, T. Zentgraf, S. Zhang, Nature Communications (2013), 4

Huang, Lingling, Xianzhong Chen, Holger Mühlenbernd, Hao Zhang, Shumei Chen, Benfeng Bai, Qiaofeng Tan, et al. “Three-Dimensional Optical Holography Using a Plasmonic Metasurface.” Nature Communications 4 (2013). https://doi.org/10.1038/ncomms3808.


Reversible Three-Dimensional Focusing of Visible Light with Ultrathin Plasmonic Flat Lens

X. Chen, L. Huang, H. Mühlenbernd, G. Li, B. Bai, Q. Tan, G. Jin, C. Qiu, T. Zentgraf, S. Zhang, Advanced Optical Materials (2013), 1(7), pp. 517-521

Chen, Xianzhong, Lingling Huang, Holger Mühlenbernd, Guixin Li, Benfeng Bai, Qiaofeng Tan, Guofan Jin, Cheng-Wei Qiu, Thomas Zentgraf, and Shuang Zhang. “Reversible Three-Dimensional Focusing of Visible Light with Ultrathin Plasmonic Flat Lens.” Advanced Optical Materials 1, no. 7 (2013): 517–21. https://doi.org/10.1002/adom.201300102.


Helicity dependent directional surface plasmon polariton excitation using a metasurface with interfacial phase discontinuity

L. Huang, X. Chen, B. Bai, Q. Tan, G. Jin, T. Zentgraf, S. Zhang, Light: Science & Applications (2013), 2(3), pp. e70-e70

Huang, Lingling, Xianzhong Chen, Benfeng Bai, Qiaofeng Tan, Guofan Jin, Thomas Zentgraf, and Shuang Zhang. “Helicity Dependent Directional Surface Plasmon Polariton Excitation Using a Metasurface with Interfacial Phase Discontinuity.” Light: Science & Applications 2, no. 3 (2013): e70–e70. https://doi.org/10.1038/lsa.2013.26.


Metalens with convex and concave functionality

S. Zhang, X. Chen, L. Huang, B. Bai, Q. Tan, G. Jin, H. Mühlenbernd, T. Zentgraf, G. Li, C. Qiu, SPIE Newsroom (2013)

Zhang, Shuang, Xianzhong Chen, Lingling Huang, Benfeng Bai, Qiaofeng Tan, Guofan Jin, Holger Mühlenbernd, Thomas Zentgraf, Guixin Li, and Cheng-Wei Qiu. “Metalens with Convex and Concave Functionality.” SPIE Newsroom, 2013. https://doi.org/10.1117/2.1201304.004812.


2012

Mapping the near-field dynamics in plasmon-induced transparency

Z. Ye, S. Zhang, Y. Wang, Y. Park, T. Zentgraf, G. Bartal, X. Yin, X. Zhang, Physical Review B (2012), 86(15)

Ye, Ziliang, Shuang Zhang, Yuan Wang, Yong-Shik Park, Thomas Zentgraf, Guy Bartal, Xiaobo Yin, and Xiang Zhang. “Mapping the Near-Field Dynamics in Plasmon-Induced Transparency.” Physical Review B 86, no. 15 (2012). https://doi.org/10.1103/physrevb.86.155148.


Compact Magnetic Antennas for Directional Excitation of Surface Plasmons

Y. Liu, S. Palomba, Y. Park, T. Zentgraf, X. Yin, X. Zhang, Nano Letters (2012), 12(9), pp. 4853-4858

Liu, Yongmin, Stefano Palomba, Yongshik Park, Thomas Zentgraf, Xiaobo Yin, and Xiang Zhang. “Compact Magnetic Antennas for Directional Excitation of Surface Plasmons.” Nano Letters 12, no. 9 (2012): 4853–58. https://doi.org/10.1021/nl302339z.


Dual-polarity plasmonic metalens for visible light

X. Chen, L. Huang, H. Mühlenbernd, G. Li, B. Bai, Q. Tan, G. Jin, C. Qiu, S. Zhang, T. Zentgraf, Nature Communications (2012), 3, 1198

Chen, Xianzhong, Lingling Huang, Holger Mühlenbernd, Guixin Li, Benfeng Bai, Qiaofeng Tan, Guofan Jin, Cheng-Wei Qiu, Shuang Zhang, and Thomas Zentgraf. “Dual-Polarity Plasmonic Metalens for Visible Light.” Nature Communications 3 (2012). https://doi.org/10.1038/ncomms2207.


Control of plasmon dynamics in coupled plasmonic hybrid mode microcavities

N.D. Lanzillotti-Kimura, T. Zentgraf, X. Zhang, Physical Review B (2012), 86(4)

Lanzillotti-Kimura, N. D., Thomas Zentgraf, and X. Zhang. “Control of Plasmon Dynamics in Coupled Plasmonic Hybrid Mode Microcavities.” Physical Review B 86, no. 4 (2012). https://doi.org/10.1103/physrevb.86.045309.


Slow-light dispersion by transparent waveguide plasmon polaritons

A. Ishikawa, R.F. Oulton, T. Zentgraf, X. Zhang, Physical Review B (2012), 85(15)

Ishikawa, Atsushi, Rupert F. Oulton, Thomas Zentgraf, and Xiang Zhang. “Slow-Light Dispersion by Transparent Waveguide Plasmon Polaritons.” Physical Review B 85, no. 15 (2012). https://doi.org/10.1103/physrevb.85.155108.


Dispersionless Phase Discontinuities for Controlling Light Propagation

L. Huang, X. Chen, H. Mühlenbernd, G. Li, B. Bai, Q. Tan, G. Jin, T. Zentgraf, S. Zhang, Nano Letters (2012), 12(11), pp. 5750-5755

Huang, Lingling, Xianzhong Chen, Holger Mühlenbernd, Guixin Li, Benfeng Bai, Qiaofeng Tan, Guofan Jin, Thomas Zentgraf, and Shuang Zhang. “Dispersionless Phase Discontinuities for Controlling Light Propagation.” Nano Letters 12, no. 11 (2012): 5750–55. https://doi.org/10.1021/nl303031j.


2011

A Carpet Cloak for Visible Light

M. Gharghi, C. Gladden, T. Zentgraf, Y. Liu, X. Yin, J. Valentine, X. Zhang, Nano Letters (2011), 11(7), pp. 2825-2828

Gharghi, Majid, Christopher Gladden, Thomas Zentgraf, Yongmin Liu, Xiaobo Yin, Jason Valentine, and Xiang Zhang. “A Carpet Cloak for Visible Light.” Nano Letters 11, no. 7 (2011): 2825–28. https://doi.org/10.1021/nl201189z.


A graphene-based broadband optical modulator

M. Liu, X. Yin, E. Ulin-Avila, B. Geng, T. Zentgraf, L. Ju, F. Wang, X. Zhang, Nature (2011), 474(7349), pp. 64-67

Liu, Ming, Xiaobo Yin, Erick Ulin-Avila, Baisong Geng, Thomas Zentgraf, Long Ju, Feng Wang, and Xiang Zhang. “A Graphene-Based Broadband Optical Modulator.” Nature 474, no. 7349 (2011): 64–67. https://doi.org/10.1038/nature10067.


Towards the Origin of the Nonlinear Response in Hybrid Plasmonic Systems

T. Utikal, T. Zentgraf, T. Paul, C. Rockstuhl, F. Lederer, M. Lippitz, H. Giessen, Physical Review Letters (2011), 106(13)

Utikal, Tobias, Thomas Zentgraf, Thomas Paul, Carsten Rockstuhl, Falk Lederer, Markus Lippitz, and Harald Giessen. “Towards the Origin of the Nonlinear Response in Hybrid Plasmonic Systems.” Physical Review Letters 106, no. 13 (2011). https://doi.org/10.1103/physrevlett.106.133901.


Development of Bulk Optical Negative Index Fishnet Metamaterials: Achieving a Low-Loss and Broadband Response Through Coupling

J. Valentine, S. Zhang, T. Zentgraf, X. Zhang, Proceedings of the IEEE (2011), 99(10), pp. 1682-1690

Valentine, Jason, Shuang Zhang, Thomas Zentgraf, and Xiang Zhang. “Development of Bulk Optical Negative Index Fishnet Metamaterials: Achieving a Low-Loss and Broadband Response Through Coupling.” Proceedings of the IEEE 99, no. 10 (2011): 1682–90. https://doi.org/10.1109/jproc.2010.2094593.


Tailoring the photonic band splitting in metallodielectric photonic crystal superlattices

T. Utikal, T. Zentgraf, S.G. Tikhodeev, M. Lippitz, H. Giessen, Physical Review B (2011), 84(7)

Utikal, Tobias, Thomas Zentgraf, Sergei G. Tikhodeev, Markus Lippitz, and Harald Giessen. “Tailoring the Photonic Band Splitting in Metallodielectric Photonic Crystal Superlattices.” Physical Review B 84, no. 7 (2011). https://doi.org/10.1103/physrevb.84.075101.


Plasmonic Luneburg and Eaton lenses

T. Zentgraf, Y. Liu, M.H. Mikkelsen, J. Valentine, X. Zhang, Nature Nanotechnology (2011), 6(3), pp. 151-155

Zentgraf, Thomas, Yongmin Liu, Maiken H. Mikkelsen, Jason Valentine, and Xiang Zhang. “Plasmonic Luneburg and Eaton Lenses.” Nature Nanotechnology 6, no. 3 (2011): 151–55. https://doi.org/10.1038/nnano.2010.282.


2010

Transformational Plasmon Optics

Y. Liu, T. Zentgraf, G. Bartal, X. Zhang, Nano Letters (2010), 10(6), pp. 1991-1997

Liu, Yongmin, Thomas Zentgraf, Guy Bartal, and Xiang Zhang. “Transformational Plasmon Optics.” Nano Letters 10, no. 6 (2010): 1991–97. https://doi.org/10.1021/nl1008019.


An Optical “Janus” Device for Integrated Photonics

T. Zentgraf, J. Valentine, N. Tapia, J. Li, X. Zhang, Advanced Materials (2010), 22(23), pp. 2561-2564

Zentgraf, Thomas, Jason Valentine, Nicholas Tapia, Jensen Li, and Xiang Zhang. “An Optical ‘Janus’ Device for Integrated Photonics.” Advanced Materials 22, no. 23 (2010): 2561–64. https://doi.org/10.1002/adma.200904139.


All-Liquid Photonic Microcavity Stabilized by Quantum Dots

T. Yim, T. Zentgraf, B. Min, X. Zhang, Journal of the American Chemical Society (2010), 132(7), pp. 2154-2156

Yim, Tae-Jin, Thomas Zentgraf, Bumki Min, and Xiang Zhang. “All-Liquid Photonic Microcavity Stabilized by Quantum Dots.” Journal of the American Chemical Society 132, no. 7 (2010): 2154–56. https://doi.org/10.1021/ja909483w.


Far-field measurement of ultra-small plasmonic mode volume

S. Zhang, Y. Park, Y. Liu, T. Zentgraf, X. Zhang, Optics Express (2010), 18(6), 6048

Zhang, Shuang, Yong-Shik Park, Yongmin Liu, Thomas Zentgraf, and Xiang Zhang. “Far-Field Measurement of Ultra-Small Plasmonic Mode Volume.” Optics Express 18, no. 6 (2010). https://doi.org/10.1364/oe.18.006048.


Extremely low-loss slow-light modes in plasmonic dielectric hybrid systems

A. Ishikawa, R.F. Oulton, T. Zentgraf, X. Zhang, in: Plasmonics: Metallic Nanostructures and Their Optical Properties VIII, SPIE, 2010

Ishikawa, Atsushi, Rupert F. Oulton, Thomas Zentgraf, and Xiang Zhang. “Extremely Low-Loss Slow-Light Modes in Plasmonic Dielectric Hybrid Systems.” In Plasmonics: Metallic Nanostructures and Their Optical Properties VIII, edited by Mark I. Stockman. SPIE, 2010. https://doi.org/10.1117/12.860190.


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Prof. Dr. Thomas Zentgraf

Ultraschnelle Nanophotonik

Thomas Zentgraf
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