Holographic data storage media employing phase-change reflector

We have proposed a novel structure of holographic data storage media, employing a phase-change (PC) reflector for optical disc applications. The PC layer, which is initially amorphous and has a low reflectivity in a write process, works as an absorber and inhibits reflected stray beam exposure. After the write process, the PC layer is crystallized and its reflectivity is switched to a high state, realizing a sufficient signal beam intensity in a read process. Experimental results show a low noise and a high signal-to-noise ratio, and a potential to have a large multiplexing number in the PC reflector.