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5 March 2022 Dynamically tunable all-dielectric nonlinear metasurfaces incorporating phase-change chalcogenides
Muliang Zhu, Sajjad Abdollahramezani, Yuankai Tang, Guoce Yang, Chentao Li, Tianren Fan, Xi Wu, Hayk Harutyunyan, Ali Adibi
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Proceedings Volume PC12010, Photonic and Phononic Properties of Engineered Nanostructures XII; PC120100F (2022) https://doi.org/10.1117/12.2617557
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
Subwavelength nonlinear optical sources with high efficiency have received extensive attention although strong dynamic tunability of these sources is still elusive. Germanium antimony telluride (GST) as a well-established phase-change chalcogenide is a promising candidate for the reconfiguration of subwavelength nanostructures. Here, we design an electromagnetically induced transparency (EIT)-based high-quality-factor (high-Q) silicon metasurface that is actively controlled with a quarter-wave asymmetric Fabry-Perot cavity incorporating GST to modulate the relative phase of incident and reflected pump waves. We demonstrate a multi-level third-harmonic generation (THG) switch with a theoretical modulation depth as high as ~ 70 dB for the fundamental C-band crossing through multiple intermediate states of GST. This study shows the high potential of GST-based dynamic nonlinear photonic switches for a wide range of applications ranging from communications to optical computing.
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Muliang Zhu, Sajjad Abdollahramezani, Yuankai Tang, Guoce Yang, Chentao Li, Tianren Fan, Xi Wu, Hayk Harutyunyan, and Ali Adibi "Dynamically tunable all-dielectric nonlinear metasurfaces incorporating phase-change chalcogenides", Proc. SPIE PC12010, Photonic and Phononic Properties of Engineered Nanostructures XII, PC120100F (5 March 2022); https://doi.org/10.1117/12.2617557
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KEYWORDS
Chalcogenides
Modulation
Switches
Optical communications
Optical computing
Phase shift keying
Refraction
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