High-Density Holographic Data Storage Using Three-Dimensional Shift Multiplexing with Spherical Reference Wave

Abstract

In this study, we propose a three-dimensional shift multiplexing technique using a spherical reference wave. By utilizing a spherical reference wave, multiplex recording is enabled in this system by simply displacing the recording medium. The utilization of a spherical reference wave makes it possible to realize three-dimensional multiplexing, which uses parallel directions of the medium surface and thickness direction. It is also expected that this approach will improve the recording density as compared with the conventional multiplex technique. We report the numerical and experimental evaluation results of our high-density recording and reproduction system based on this principle.