Optical polarization conversion based on guided-mode resonance through a silicon film perforated L-shaped holes

Abstract:We numerically study the guided-mode resonances excited in an 80 nm thick silicon waveguide perforated with a square array of L-shaped holes. The broken symmetry of the L-shaped holes array splits the degenerate guide-mode resonances of symmetric circular holes array into four nondegenerate resonances via localized resonances under normally incident light, forming multiple narrow minima in the transmitted spectra. The conversion of optical polarization is realized through a superposition of the co-polarization and the cross-polarization of electromagnetic waves radiated by guided-mode resonance.

https://doi.org/10.1364/OME.8.002395