TY - JOUR AB - We present strong enhancement of third harmonic generation in an amorphous silicon metasurface consisting of elliptical nano resonators. We show that this enhancement originates from a new type of multi-mode Fano mechanism. These ‘Super-Fano’ resonances are investigated numerically in great detail using full-wave simulations. The theoretically predicted behavior of the metasurface is experimentally verified by linear and nonlinear transmission spectroscopy. Moreover, quantitative nonlinear measurements are performed, in which an absolute conversion efficiency as high as ηmax ≈ 2.8 × 10−7 a peak power intensity of 1.2 GW cm−2 is found. Compared to an unpatterned silicon film of the same thickness amplification factors of up to ~900 are demonstrated. Our results pave the way to exploiting a strong Fano-type multi-mode coupling in metasurfaces for high THG in potential applications. AU - Hähnel, David AU - Golla, Christian AU - Albert, Maximilian AU - Zentgraf, Thomas AU - Myroshnychenko, Viktor AU - Förstner, Jens AU - Meier, Cedrik ID - 44097 IS - 1 JF - Light: Science & Applications KW - tet_topic_meta SN - 2047-7538 TI - A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces VL - 12 ER - TY - JOUR AB - Dielectric metasurfaces provide a unique platform for efficient harmonic generation and optical wavefront manipulation at the nanoscale. Tailoring phase and amplitude of a nonlinearly generated wave with a high emission efficiency using resonance-based metasurfaces is a challenging task that often requires state-of-the-art numerical methods. Here, we propose a simple yet effective approach combining a sampling method with a Monte Carlo approach to design the third-harmonic wavefront generated by all-dielectric metasurfaces composed of elliptical silicon nanodisks. Using this approach, we theoretically demonstrate the full nonlinear 2π phase control with a uniform and highest possible amplitude in the considered parameter space, allowing us to design metasurfaces operating as third harmonic beam deflectors capable of steering light into a desired direction with high emission efficiency. The TH beam deflection with a record calculated average conversion efficiency of 1.2 × 10–1 W–2 is achieved. We anticipate that the proposed approach will be widely applied as alternative to commonly used optimization algorithms with higher complexity and implementation effort for the design of metasurfaces with other holographic functionalities. AU - Hähnel, David AU - Förstner, Jens AU - Myroshnychenko, Viktor ID - 45596 JF - ACS Photonics KW - tet_topic_meta SN - 2330-4022 TI - Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces ER - TY - CHAP AB - We apply the Discontinuous Galerkin Time Domain (DGTD) method for numerical simulations of the second harmonic generation from various metallic nanostructures. A Maxwell–Vlasov hydrodynamic model is used to describe the nonlinear effects in the motion of the excited free electrons in a metal. The results are compared with the corresponding experimental measurements for split-ring resonators and plasmonic gap antennas. AU - Grynko, Yevgen AU - Förstner, Jens ED - Agrawal, Arti ID - 3836 KW - tet_topic_numerics KW - tet_topic_shg KW - tet_topic_meta SN - 0342-4111 T2 - Recent Trends in Computational Photonics TI - Simulation of Second Harmonic Generation from Photonic Nanostructures Using the Discontinuous Galerkin Time Domain Method ER - TY - JOUR AB - We report on second harmonic generation spectroscopy on a series of rectangular arrays of split-ring resonators. Within the sample series, the lattice constants are varied, but the area of the unit cell is kept fixed. The SHG signal intensity of the different arrays upon resonant excitation of the fundamental plasmonic mode strongly depends on the respective arrangement of the split-ring resonators. This finding can be explained by variations of the electromagnetic interactions between the split-ring resonators in the different arrays. The experimental results are in agreement with numerical calculations based on the discontinuous Galerkin time-domain method. (PDF) The role of electromagnetic interactions.... Available from: https://www.researchgate.net/publication/297612326_The_role_of_electromagnetic_interactions_in_second_harmonic_generation_from_plasmonic_metamaterials [accessed Aug 13 2018]. AU - Alberti, Julian AU - Linnenbank, Heiko AU - Linden, Stefan AU - Grynko, Yevgen AU - Förstner, Jens ID - 3886 IS - 2 JF - Applied Physics B KW - tet_topic_shg KW - tet_topic_meta SN - 0946-2171 TI - The role of electromagnetic interactions in second harmonic generation from plasmonic metamaterials VL - 122 ER - TY - JOUR AU - Grynko, Yevgen AU - Zentgraf, Thomas AU - Meier, Torsten AU - Förstner, Jens ID - 1454 IS - 9 JF - Applied Physics B KW - tet_topic_meta KW - tet_topic_shg SN - 0946-2171 TI - Simulations of high harmonic generation from plasmonic nanoparticles in the terahertz region VL - 122 ER - TY - CONF AB - We perform experiments on resonant second-harmonic generation from planar gold split-ring-resonator arrays under normal incidence of light as a function of the lattice constant. Optimum nonlinear conversion occurs at intermediate lattice constants. AU - Niesler, Fabian B. AU - Linden, Stefan AU - Förstner, Jens AU - Grynko, Yevgen AU - Meier, Torsten AU - Wegener, Martin ID - 4039 IS - 1 KW - tet_topic_shg KW - tet_topic_meta SN - 9781557529435 T2 - Conference on Lasers and Electro-Optics 2012 TI - Collective effects in second-harmonic generation from split-ring-resonator arrays VL - 109 ER - TY - CONF AB - Previous experimental measurements and numerical simulations give evidence of strong electric and magnetic field interaction between split-ring resonators in dense arrays. One can expect that such interactions have an influence on the second harmonic generation. We apply the Discontinuous Galerkin Time Domain method and the hydrodynamic Maxwell-Vlasov model to simulate the linear and nonlinear optical response from SRR arrays. The simulations show that dense placement of the constituent building blocks appears not always optimal and collective effects can lead to a significant suppression of the near fields at the fundamental frequency and, consequently, to the decrease of the SHG intensity. We demonstrate also the great role of the symmetry degree of the array layout which results in the variation of the SHG efficiency in range of two orders of magnitude. AU - Grynko, Yevgen AU - Meier, Torsten AU - Linden, Stefan AU - Niesler, Fabian B. P. AU - Wegener, Martin AU - Förstner, Jens ED - Betz, Markus ED - Elezzabi, Abdulhakem Y. ED - Song, Jin-Joo ED - Tsen, Kong-Thon ID - 3961 KW - tet_topic_shg KW - tet_topic_meta T2 - Ultrafast Phenomena and Nanophotonics XVII TI - Optimal second-harmonic generation in split-ring resonator arrays VL - 8623 ER - TY - JOUR AB - Optical experiments on second-harmonic generation from split-ring-resonator square arrays show a nonmonotonic dependence of the conversion efficiency on the lattice constant. This finding is interpreted in terms of a competition between dilution effects and linewidth or near-field changes due to interactions among the individual elements in the array. AU - Linden, S. AU - Niesler, F. B. P. AU - Förstner, Jens AU - Grynko, Yevgen AU - Meier, Torsten AU - Wegener, M. ID - 3970 IS - 1 JF - Physical Review Letters KW - tet_topic_shg KW - tet_topic_meta SN - 0031-9007 TI - Collective Effects in Second-Harmonic Generation from Split-Ring-Resonator Arrays VL - 109 ER - TY - CONF AB - We simulate the linear and nonlinear optical response from split-ring resonator (SRR) arrays to study collective effects between the constituent SRRs that determine spectral properties of the second harmonic generation (SHG). We apply the Discontinuous Galerkin Time Domain (DGTD) method and the hydrodynamic Maxwell-Vlasov model to calculate the SHG emission. Our model is able to qualitatively reproduce and explain the non-monotonic dependence of the spectral SHG transmission measured experimentally for SRR arrays with different lattice constants AU - Grynko, Yevgen AU - Meier, Torsten AU - Linden, Stefan AU - Niesler, Fabian B. P. AU - Wegener, Martin AU - Förstner, Jens ID - 3967 IS - 1 KW - tet_topic_meta KW - tet_topic_shg TI - Near-field coupling and second-harmonic generation in split-ring resonator arrays VL - 1475 ER - TY - JOUR AB - A simulation environment for metallic nanostructures based on the Discontinuous Galerkin Time Domain method is presented. The model is used to compute the linear and nonlinear optical response of split ring resonators and to study physical mechanisms that contribute to second harmonic generation. AU - Grynko, Yevgen AU - Förstner, Jens AU - Meier, Torsten ID - 4044 IS - 1 JF - AAPP | Atti della Accademia Peloritana dei Pericolanti KW - tet_topic_numerics KW - tet_topic_shg KW - tet_topic_meta SN - 1825-1242 TI - Application of the discontinous Galerkin time domain method to the optics of metallic nanostructures VL - 89 ER - TY - CONF AB - A simulation environment for metallic nanostructures based on the Discontinuous Galerkin Time Domain method is presented. It is used to model optical transmission by silver bi‐chiral plasmonic crystals. The results of simulations qualitatively and quantitavely agree with experimental measurements of transmitted circular polarization. AU - Grynko, Yevgen AU - Förstner, Jens AU - Meier, Torsten AU - Radke, André AU - Gissibl, Timo AU - Braun, Paul V. AU - Giessen, Harald ED - Chigrin, Dmitry N. ID - 4042 IS - 1 KW - tet_topic_meta TI - Application of the Discontinuous Galerkin Time Domain Method to the Optics of Bi-Chiral Plasmonic Crystals VL - 1398 ER - TY - CONF AB - We discuss second-harmonic generation experiments on planar arrays of magnetic split-ring resonators, using 150 fs pulses at 1.5 mum wavelength. Lithographic tuning reveals by far the largest signals when exciting the magnetic-dipole resonance. AU - Klein, M. W. AU - Enkrich, C. AU - Wegener, M. AU - Förstner, Jens AU - Moloney, J. V. AU - Hoyer, W. AU - Stroucken, T. AU - Meier, Torsten AU - Koch, S. W. AU - Linden, S. ID - 4241 KW - tet_topic_meta SN - 9781557528131 T2 - 2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference TI - Optical experiments on second-harmonic generation from metamaterials consisting of split-ring resonators ER - TY - CONF AB - We study optical second-harmonic generation from planar arrays of magnetic split-ring resonators at 1.5 microns resonance wavelength. We obtain by far the largest signals when exciting the magnetic-dipole resonance. AU - Klein, Matthias W. AU - Enkrich, Christian AU - Wegener, Martin AU - Förstner, Jens AU - Moloney, Jerome V. AU - Hoyer, Walter AU - Stroucken, Tineke AU - Meier, Torsten AU - Koch, Stephan W. AU - Linden, Stefan ID - 4191 KW - tet_topic_meta SN - 155752808X T2 - Photonic Metamaterials: From Random to Periodic TI - Optical Experiments on Second-Harmonic Generation with Metamaterials Composed of Split-Ring Resonators ER -