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17 March 2023 Optical Kerr effect in harmonic generation metasurfaces featuring quasibound states of continuum
Muliang Zhu, Chentao Li, Sajjad Abdollahramezani, Tianren Fan, Xi Wu, Todd J. Walters, Devin K. Brown, Kirsten Masselink, Yolande Berta, Hayk Harutyunyan, Ali Adibi
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Proceedings Volume PC12431, Photonic and Phononic Properties of Engineered Nanostructures XIII; PC1243111 (2023) https://doi.org/10.1117/12.2661615
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
Bound states in the continuum (BIC) to achieve highly efficient frequency conversion using high quality-factor (high-Q) metasurfaces have been demonstrated using symmetry-broken structures with high robustness; however, the breaking-symmetry tactics are typically limited to one of the dimensions of the structures, which restricts the nonlinearity with BIC. In this work, we present a new metasurface structure in the form of an array of unit cells composed of two identical nano-bars with two mirror-symmetric corners cut into each nano-bar to break this limit. By using the high refractive index and large third-order nonlinearity of amorphous silicon (a-Si), we demonstrate ultra-high theoretical Qs up to ~ 2×10^5. Owing to the large nearfield enhancement in the meta-atoms, we observe optical Kerr effect in efficient third harmonic generation from the a-Si BIC metasurfaces via different levels of pump power, which paves the way for variational quasi-BIC for switchable nonlinear generation.
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Muliang Zhu, Chentao Li, Sajjad Abdollahramezani, Tianren Fan, Xi Wu, Todd J. Walters, Devin K. Brown, Kirsten Masselink, Yolande Berta, Hayk Harutyunyan, and Ali Adibi "Optical Kerr effect in harmonic generation metasurfaces featuring quasibound states of continuum", Proc. SPIE PC12431, Photonic and Phononic Properties of Engineered Nanostructures XIII, PC1243111 (17 March 2023); https://doi.org/10.1117/12.2661615
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KEYWORDS
Kerr effect
Harmonic generation
Amorphous silicon
Nanophotonics
Near infrared
Nonlinear optics
Photonics
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