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Spectral shift and Q-change of circular and square-shaped optical microcavity modes due to periodic sidewall surface roughness

Svetlana V. Boriskina·Trevor M. Benson·Phillip Sewell·Alexander I. Nosich
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Abstract

Radiation loss and resonant frequency shift due to sidewall surface roughness of circular and square high-contrast microcavities are estimated and compared by using a boundary integral equations method. An effect of various harmonic components of the contour perturbation on the Whispering-Gallery (WG) modes in the circular microdisk and WG-like modes in the square microcavity is demonstrated. In both cases, contour deformations that are matched to the mode field pattern cause the most significant frequency detuning and Q-factor change. Favorably mode-matched deformations have been found, enabling one to manipulate the Q-factors of the microcavity modes.

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Svetlana V. Boriskina, Trevor M. Benson, Phillip Sewell, Alexander I. Nosich. 2005-06-16. Spectral shift and Q-change of circular and square-shaped optical microcavity modes due to periodic sidewall surface roughness. https://doi.org/10.1364/josab.21.001792

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