Photonics glass for PHB holographic memory

Andrei L. Mikaelian

A. L. Mikaeliane, V. I. Bobrinev, S M Naumov +1 more

Eiji Yagyu, Tetsuya Nishimura, Motomu Yoshimura

We have reported persistent spectral hole burning (PHB) in anthraquinone derivatives. 1-3) Hole burning spectroscopy desires high resolution to detect narrow and shallow holes. Laser induced grating (Holography) technique is very effective for the investigation of a shallow hole, because it enables to detect a small signal without a large background. 4-6) In addition, we can achieve many holographic applications: 3D image storage and reconstruction, holographic memory, holographic computing, etc. However, we should note that hole signal represents a diffraction efficiency in holographic detection, not the absorption spectrum. Consequently, material characteristics, hole width, depth, area, Debye-Waller factor, etc., are not directly obtainable using holographic detection.

Kazuyuki Horie, Shinjiro Machida, Takashi Yamashita

Photochemical Hole Burning (PHB) has attracted considerable interest not only as a tool for high resolution spectroscopy of amorphous solid at low temperature but also as a possible means for freguency-domain high-density optical storage.1) Many recent investigations have been devoted to a photon-gated mechanism because it allows nondestructive readout in utilizing PHB for a practical optical memory system. The mechanisms of previously reported photon-gated PHB systems are two-step photoionization, photodecomposition, and photoinduced donor-acceptor electron transfer reactions.1)

Masayuki Nogami, Subramanian Tamil Selvan, Hongwei Song

Motomu Yoshimura, Tetsuya Nishimura, Noriaki Tsukada

We have shown a possibility to store data at more than 600x10 8 bits/cm 2, by forming a double-layered PHB system. This memory density is the highest one reported so far.