Transmitted-type guided-mode resonance phase image system for sensing refractive index distribution

We propose a transmitted-type guided-mode resonance (GMR) image system to display refractive index (RI) distribution over the GMR structure using phase values obtained by the five-step phase shift interferometry. The primary result shows that this system can obtain a phase image corresponding to two area with two different material RIs, 1.0 (air) and 1.4 (polymer), respectively, on the GMR device surface and their phase difference is 140°.