Dual-plane in-line digital holography based on liquid crystal on silicon spatial light modulator

Abstract

A dual-plane in-line digital holographic method is proposed with a liquid crystal on silicon (LCOS) spatial light modulator (SLM) for recording holograms at two slightly displaced planes. The computer-generated chirp-like complex reflectance is displayed on the LCOS SLM to adapt the object beam at two planes for recording two holograms processed to eliminate the DC term and twin image accurately; no mechanical components or manual operation during data acquisition is required. The proposed approach improves the speed, accuracy, and stability of the experiment. Computer simulation and experiments for both amplitude and phase objects are carried out to validate the proposed method.

Low insertion loss silicon-based spatial light modulator with high reflective materials outside Fabry–Perot cavity*

“…However, the extinction ratio of the present spatial light modulator is low and the insertion loss is high for practical applications due to materials problems. [32][33][34][35][36][37] Here in this work, we propose a reflection-type silicon-based spatial light modulator with Fabry-Perot cavity structure. We adopt the dielectric thin film to replace the traditional metal film in order to reduce the insertion loss.…”