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arXiv 2403.01434physics.optics
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用于高效光频率转换的、由硅光子晶体波导上少层 GaSe 晶体诱导产生的微腔

Microcavity induced by few-layer GaSe crystal on silicon photonic crystal waveguide for efficient optical frequency conversion

Xiaoqing Chen, Yanyan Zhang, Yingke Ji, Yu Zhang, Jianguo Wang, Xianghu Wu, Chenyang Zhao, Liang Fang, Biqiang Jiang, Jianlin Zhao, Xuetao Gan

AI总结:

该研究通过在硅光子晶体波导上集成少层 GaSe 诱导高 Q 微腔,增强光与非线性材料相互作用,实现创纪录片上 SHG 效率及宽带 SFG 与非相干光转换。

摘要:

我们展示了通过集成少层 GaSe 晶体,在硅光子晶体(PC)波导上后诱导产生高质量微腔,这为高效片上光频率转换提供了可能。GaSe 的集成使 PC 波导模式的色散带移入带隙,从而形成由裸 PC 波导约束的局域模式。得益于微腔边界处较小的折射率对比度,可以可靠地获得超过 10^4 的品质(Q)因子。借助微腔模式增强的光-GaSe 相互作用以及 GaSe 的高二阶非线性,实现了显著的二次谐波产生(SHG)与和频产生(SFG)。研究获得了高达 131100% W^-1 的创纪录片上 SHG 转换效率,从而能够在亚毫瓦连续波(CW)激光泵浦下对谐振模式进行清晰的 SHG 成像。在谐振 CW 激光泵浦驱动下,并使用另一束覆盖宽电信波段的 CW 激光作为泵浦,成功实现了强 SFG。在集成 GaSe-PC 波导中,还实现了对具有低光谱功率密度的非相干超辐射发光二极管的宽带频率转换。我们的结果有望为硅光子集成电路中的高效光-物质相互作用、非线性光子学和光源产生提供新策略。

英文摘要:

We demonstrate the post-induction of high-quality microcavity on silicon photonic crystal (PC) waveguide by integrating few-layer GaSe crystal, which promises highly efficient on-chip optical frequency conversions. The integration of GaSe shifts the dispersion bands of the PC waveguide mode into the bandgap, resulting in localized modes confined by the bare PC waveguides. Thanks to the small contrast of refractive index at the boundaries of microcavity, it is reliably to obtain quality (Q) factors exceeding 10^4. With the enhanced light-GaSe interaction by the microcavity modes and high second-order nonlinearity of GaSe, remarkable second-harmonic generation (SHG) and sum-frequency generation (SFG) are achieved. A record-high on-chip SHG conversion efficiency of 131100% W^-1 is obtained, enabling the clear SHG imaging of the resonant modes with the pump of sub-milliwatts continuous-wave (CW) laser. Driven by a pump of on-resonance CW laser, strong SFGs are successfully carried out with the other pump of a CW laser spanning over the broad telecom-band. Broadband frequency conversion of an incoherent superluminescent light-emitting diode with low spectral power density is also realized in the integrated GaSe-PC waveguide. Our results are expected to provide new strategies for high-efficiency light-matter interactions, nonlinear photonics and light source generation in silicon photonic integrated circuits.

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