Active control of highly efficient third-harmonic generation in ultrathin nonlinear metasurfaces |
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| Affiliation: | 1. State Key Laboratory for Mesoscopic Physics & Department of Physics, Collaborative Innovation Center of Quantum Matter, Peking University, Beijing 100871, People''s Republic of China;2. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, People''s Republic of China;1. Department of Physics, Faculty of Science, University of Arak, Arak 3815688394, Iran;2. Department of Chemistry, Faculty of Science, University of Ilam, P.O. Box 65315-516, Ilam, Iran;1. Air Force Research Laboratory, Sensors Directorate, Wright Patterson AFB, OH, 45433, USA;2. SURVICE Engineering, Dayton, OH, 45431, USA;1. Laboratório de Instrumentação e Fotônica, Programa de Engenharia Elétrica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, 21941-598, Brazil;2. Instituto de Física, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, 20559-900, Brazil;3. Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, RJ, 22453-900, Brazil;4. Instituto Politécnico, Universidade do Estado do Rio de Janeiro, P.O. Box 97282, Nova Friburgo, RJ, 28601-970, Brazil;1. College of Information Science and Engineering, Huaqiao University, Xiamen, Fujian, 361021, China;2. Institute of Optoelectronic Engineering, Jinan University Guangdong, Guangzhou, 510632, China |
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| Abstract: | Active electric control of highly efficient third harmonic generation was realized in an ultrathin nonlinear metasurface by using a nanocomposite consisting of gold nanoparticles dispersed in polycrystalline strontium titanate as the electro-optic material. Owing to the nonlinearity enhancement associated with the slow light effect, quantum confinement effect, and field-reinforcement, a high conversion efficiency of 3 × 10−5 was obtained, which is two orders of magnitude larger than previously reported efficiencies at comparable pump intensities. A modulation of 12% in the intensity of the third harmonic generation and a 30-nm shift in the transparency window center were achieved by varying the applied voltage from −30 V to zero. Our results pave the way toward the realization of multi-functional integrated photonic devices and chips based on metasurfaces. |
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| Keywords: | Metamaterial-induced transparency Third harmonic generation Nanocomposite |
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