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Extreme Sensitivity of Output Directionality to Boundary Perturbation in Wavelength-Scale Microcavities

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.

preprint2012arXivOpen access
Li GeQinghai SongBrandon ReddingHui Cao
physics.optics
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Open access4 authors1 topic
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Li GeQinghai SongBrandon ReddingHui Cao

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