Square-shaped two-dimensional optical microcavities (µ-cavities) were investigated for possible applications as filters for dense wavelength-division multiplexing. Multimode cavity resonances were observed in the elastic scattering of ≈200-µm square-shaped µ-cavities in fused silica. Based on a two-dimensional k-space representation, we accounted for the multimode spectrum by different normal modes with rays confined by total internal reflection. The cavity-mode trajectories need not be closed after each round trip. Single-mode spectra are expected from smaller square-shaped µ-cavities.
© 2001 Optical Society of America
(230.3990) Optical devices : Micro-optical devices
A. W. Poon, F. Courvoisier, and R. K. Chang, "Multimode resonances in square-shaped optical microcavities," Opt. Lett. 26, 632-634 (2001)