Photosensitive post-tuning of chalcogenide photonic crystal waveguides

Abstract

We present experimental results on post-tuning the dispersion of a two-dimensional photonic crystal waveguide made from Ge 33 As 12 Se 55 chalcogenide glass by exploiting the material photosensitivity to nearbandgap light.The change in the refractive index and volume of the material in response to exposure to 633nm light resulted in a shift of more than 5nm in the resonant coupling wavelength between a tapered optical fiber and the modes of a W1 waveguide.This represents a first proof of principle demonstration of the photosensitive post-tuning of a planar photonic crystal device.