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arXiv · 2206.03143

High-efficiency second-harmonic and sum-frequency generation in a silicon nitride microring integrated with few-layer GaSe

Binbin Wang·Yafei Ji·Linpeng Gu·Liang Fang·Xuetao Gan·Jianlin Zhao
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Abstract

Silicon nitride (SiN) photonics platform has attributes of ultra-low linear and nonlinear propagation losses and CMOS-compatible fabrication process, promising large-scale multifunctional photonic circuits. However, the centrosymmetric nature of SiN inhibits second-order nonlinear optical responses in its photonics platform, which is desirable for developing efficient nonlinear active devices. Here, we demonstrate high-efficiency second-order nonlinear processes in SiN photonics platform by integrating a few-layer GaSe flake on a SiN microring resonator. With the pump of microwatts continuous-wave lasers, second-harmonic generation and sum-frequency generation with the conversion efficiencies of 849%/W and 123%/W, respectively, are achieved, which benefit from the ultrahigh second-order nonlinear susceptibility of GaSe, resonance enhanced GaSe-light interaction, and phase-matching condition satisfied by the mode engineering. Combining with the easy integration, the GaSe-assisted high-efficiency second-order nonlinear processes offer a new route to enriching already strong functionality of SiN photonics platform in nonlinear optics.

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Binbin Wang, Yafei Ji, Linpeng Gu, Liang Fang, Xuetao Gan, Jianlin Zhao. 2022-06-07. High-efficiency second-harmonic and sum-frequency generation in a silicon nitride microring integrated with few-layer GaSe. https://doi.org/10.1021/acsphotonics.2c00038

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