波长尺度微腔输出方向性对边界扰动的极端敏感性
Extreme Sensitivity of Output Directionality to Boundary Perturbation in Wavelength-Scale Microcavities
摘要：
我们报告了一个令人惊讶的观察，从波长尺度的光学微腔的输出方向性显示极端敏感的腔形状的变形。腔边界在波长的万分之一量级上的变化可以将输出方向翻转180度。我们的微扰理论的基础上的分析表明，一个微小的形状变化可以导致强混合的近简并腔共振与不同的角动量，和他们的干涉决定了远场发射模式。这项工作表明，利用精心设计的波长尺度的微腔的高分辨率检测和传感应用的可能性。
英文摘要：
We report a surprising observation that the output directionality from wavelength-scale optical microcavities displays extreme sensitivity to deformations of the cavity shape. A variation of the cavity boundary on the order of ten thousandth of a wavelength may flip the output directions by 180 degrees. Our analysis based on a perturbation theory reveals that a tiny shape variation can cause a strong mixing of nearly degenerate cavity resonances with different angular momenta, and their interference determines the farfield emission pattern. This work shows the possibility of utilizing carefully-designed wavelength-scale microcavities for high-resolution detection and sensing applications.
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