Journal Article10.1063/5.0165120
Efficiently spatial field localization enabled second-harmonic and sum-frequency generation in an etchless LiNbO3 layer by guided resonant quasi-bound states in the continuum
Shijie Cai,Shu Zong,Xiaoshan Liu,Guiqiang Liu,Juan Chen,Zhengqi Liu +5 more
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TL;DR: High-Q resonances on metasurfaces enable efficient spatial field localization and nonlinear frequency conversion in an etchless LiNbO3 layer.
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Abstract: High-Q resonances on metasurfaces have yielded a feasible approach for nonlinear frequency conversion in recent years. In this work, we propose a highly efficient nonlinear metasurface based on an etchless lithium niobate (LiNbO3) layer by combining periodic silicon nanodisks. These nanodisks introduce two kinds of capabilities for achieving ultra-sharp spectral lineshapes owing to the high-Q resonances of bound states in the continuum and simultaneously attain a significantly enhanced spatial field localization within the LiNbO3 cavity owing to guided resonant behaviors. This distinctive mode engineering yielded a total efficiency of conversion of 2.8% in the second-harmonic generation and 1% for sum-frequency generation when the peak intensity of the fundamental pump was as low as 1 MW/cm2. Our method eliminates challenges to the manufacture of etched LiNbO3 thin films and allows for the efficient conversion of frequency. It is suitable for various applications, such as integrated, nonlinear nanophotonic chips, and high-speed communication.
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Citations
Polarization-insensitive and polarization-controlled dual-band third-harmonic generation in silicon metasurfaces driven by quasi-bound states in the continuum
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TL;DR: High-efficiency polarization-controlled and polarization-insensitive dual-band third-harmonic generation in silicon metasurfaces driven by quasi-bound states in the continuum.
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Tuneable Sum-Frequency Generation and Spectral Broadening Based on Proton-Exchanged Thin-Film Lithium Niobate Ridge Waveguide
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