超小腔中光波的局域手征性
Local chirality of optical waves in ultrasmall resonators
摘要：
在变形微腔中顺时针（CW）和逆时针（CCW）传播的光之间的局部手征对称性可以被波动光学效应打破，当腔尺寸接近波长时，该效应变得显著。我们发现，高品质因数共振模式下的CW和CCW射线轨道的空间分离导致在自由空间中的单向发射。在存在波导的情况下，倏逝波耦合也变成定向的，并且输出方向可以通过沿着腔边界选择耦合位置来改变。我们的研究结果表明，本地的手征性可以用来控制输出方向性，提高收集效率的超小型谐振器的发射。
英文摘要：
The local chiral symmetry between clockwise (CW) and counter-clockwise (CCW) propagating light in a deformed microcavity can be broken by wave optics effects, which become significant as the cavity size approaches the wavelength. We show that the spatial separation of the CW and CCW ray orbits underlying the high quality factor resonant modes results in unidirectional emission in free space. In the presence of a waveguide, evanescent coupling also becomes directional, and the output direction can be varied by selecting the coupling position along the cavity boundary. Our results demonstrate that the local chirality can be utilized to control the output directionality and enhance the collection efficiency of emission from ultrasmall resonators.
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