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Prof. Dr. Thomas Zentgraf

Contact
Biography
Publications
Prof. Dr. Thomas Zentgraf

Ultrafast Nanophotonics

Head - Professor

Center for Optoelectronics and Photonics (CeOPP)

Chairman - Professor

Institute for photonic quantum systems (PhoQS)

Member - Professor

Transregional Collaborative Research Centre 142

Member - Professor - Projektleiter

Phone:
+49 5251 60-5865
Fax:
+49 5251 60-5886
Office:
P8.3.03
Visitor:
Pohlweg 47-49
33098 Paderborn
Prof. Dr. Thomas Zentgraf
10/2020 - today

Chairman of the Center for Optolectronics & Photonics Paderborn

04/2011 - today

Professor for Applied Physics, Head of the Ultrafast Nanophotonics Group

Department of Physics, Paderborn University, Germany

08/2015 - 01/2016

Guest Professor

Department of Physics, Kasetsart University, Bangkok, Thailand

09/2007 - 03/2011

Research Associate

Department for Mechanical Engineering, University of California at Berkeley, USA

07/2006 - 08/2007

Postdoc

4th Physics Institute, University of Stuttgart, Germany

01/2003 - 06/2006

PhD student

Max Planck Institute for Solid State Research, Stuttgart, Germany

09/2005 - 11/2005

Visiting Researcher

Lawrence Berkeley National Laboratory, Berkeley (USA)

03/2000 - 01/2001

Master Student

Fraunhofer Institute for Applied Optics and Precision Mechanics, Jena, Germany


Open list in Research Information System

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)

<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>


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)

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.


    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


    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(n/a), 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.


      Nonlinear Imaging of Nanoscale Topological Corner States

      S.S. Kruk, W. Gao, D. Choi, T. Zentgraf, S. Zhang, Y. Kivshar, Nano Letters (2021)

      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.


        2020

        Metasurfaces help lasers to mode-lock

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


        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


        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


        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)

        <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>


          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


          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


          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


          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)

          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.


          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>


            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) (2020), n/a(n/a), 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.


              2019

              Metasurface interferometry toward quantum sensors

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


              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


              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


              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.


              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>


                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


                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


                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


                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


                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


                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


                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)


                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)


                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)


                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)


                Editorial for the theories and applications of metasurfaces

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


                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


                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


                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


                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


                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)


                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)


                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


                Metasurface holography: from fundamentals to applications

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


                Imaging the rainbow

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


                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


                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


                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)


                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)


                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


                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)


                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


                Nonlinear photonic metasurfaces

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


                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)


                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


                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


                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)


                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


                2016

                Rotational Doppler effect in nonlinear optics

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


                Designermaterialien für nichtlineare Optik

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


                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


                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


                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


                Doppler-Effekt für rotierende Objekte

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


                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


                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


                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


                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


                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


                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


                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)


                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


                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)


                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


                Hochauflösende Holografie

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


                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)


                Ag‐nanoparticles in PA-templates

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


                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)


                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


                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


                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


                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)


                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)


                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


                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


                Control of plasmon dynamics in coupled plasmonic hybrid mode microcavities

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


                Slow-light dispersion by transparent waveguide plasmon polaritons

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


                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


                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


                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


                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)


                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


                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)


                Plasmonic Luneburg and Eaton lenses

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


                2010

                Transformational Plasmon Optics

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


                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


                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


                Far-field measurement of ultra-small plasmonic mode volume

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


                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


                Light-driven nanoscale plasmonic motors

                M. Liu, T. Zentgraf, Y. Liu, G. Bartal, X. Zhang, Nature Nanotechnology (2010), 5(8), pp. 570-573


                Semiconductor plasmon laser

                V.J. Sorger, R.F. Oulton, T. Zentgraf, R. Ma, C. Gladden, L. Dai, G. Bartal, X. Zhang, in: Plasmonics: Metallic Nanostructures and Their Optical Properties VIII, SPIE, 2010


                2009

                An optical cloak made of dielectrics

                J. Valentine, J. Li, T. Zentgraf, G. Bartal, X. Zhang, Nature Materials (2009), 8(7), pp. 568-571


                Ultranarrow coupling-induced transparency bands in hybrid plasmonic systems

                T. Zentgraf, S. Zhang, R.F. Oulton, X. Zhang, Physical Review B (2009), 80(19)


                Plasmon lasers at deep subwavelength scale

                R.F. Oulton, V.J. Sorger, T. Zentgraf, R. Ma, C. Gladden, L. Dai, G. Bartal, X. Zhang, Nature (2009), 461(7264), pp. 629-632


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