用于二次谐波产生的光子双层中的扭转可调谐共振
Twist tunable resonances in photonic bilayer for second harmonic generation
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中文总结 AI 辅助
研究利用扭转可调谐共振增强扭曲光子双层中的二次谐波产生，建立分析理论联系共振频率、增强因子与材料参数、扭转角，揭示临界扭转角及不同操作状态，提供宽光谱高效可调的非线性转换途径。
中文摘要 AI 辅助
在具有扭转的光子双层中出现的莫尔结构能够实现可控的频率选择性共振响应。在此，我们利用扭转可调谐共振在与二维非线性晶体集成的扭曲光子双层中，在所需频率上增强二次谐波产生（SHG）。我们建立了一种分析理论，将共振频率和SHG增强因子与介电层的材料参数和扭转角联系起来。该理论揭示了一个临界扭转角，它将光子双层操作的两种不同状态分开：具有开放和封闭的莫尔衍射通道。高于临界角，导模的光子泄漏被抑制，SHG增强因子跃升几个数量级。本文提供了一条在莫尔光子结构中进行非线性转换的紧凑途径，该结构在宽光谱范围内高效且可调谐。
英文摘要
Moiré structure emerging in photonic bilayers stacked with a twist enables the controllable frequency selective resonant response. Here, we employ twist tunable resonances to boost second harmonic generation (SHG) at a desired frequency in twisted photonic bilayers integrated with two-dimensional nonlinear crystals. We develop an analytical theory relating the resonance frequencies and the SHG enhancement factor to the material parameters of the dielectric layers and the twist angle. The theory reveals a critical twist angle separating two distinct regimes of photonic bilayer operation: with open and closed moiré diffraction channels. Above the critical angle, the photon leakage from the guided mode is suppressed and the SHG enhancement factor rises by orders of magnitude. The paper offers a compact route to nonlinear conversion in moiré photonic structures efficient and tunable over a wide spectral range.
