Reflection Analysis of 2D-photonic Crystal Lattice Using Bragg-diffraction phenomena

Abstract

We have investigated an experimental technique to determine the lattice constant of a two-dimensional photonic crystal membrane using Bragg-diffraction measured with a FT-IR spectrometer. The membrane consisted of square air holes electrochemically etched through N-type silicon wafer. The measured data were fitted to a theoretical model to determine the lattice constant. The results were compared with the observation by an optical microscope.