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

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.

arXiv comment5 pages with 6 figures

References in corpus (1)

• Scattering matrix approach to the resonant states and Q-values of microdisk lasing cavities

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• Symmetry, degeneracy and optical confinement of modes in coupled microdisk resonators and photonic crystal cavities
• Directional emission, increased free spectral range and mode Q-factors in 2-D wavelength-scale optical microcavity structures