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Radiation loss and resonant frequency shift due to sidewall surface roughnessof circular and square high-contrast microcavities are estimated and comparedby using a boundary integral equations method. An effect of various harmoniccomponents of the contour perturbation on the Whispering-Gallery (WG) modes inthe circular microdisk and WG-like modes in the square microcavity isdemonstrated. In both cases, contour deformations that are matched to the modefield pattern cause the most significant frequency detuning and Q-factorchange. Favorably mode-matched deformations have been found, enabling one tomanipulate the Q-factors of the microcavity modes.Comment: 5 pages with 6 figure

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