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Hyomen Kagaku

Data storage systems using photochemical hole burning. Special kind of photochromism.

Toshiro Tani

Published Jan 1, 1987• 0 citations
Publisher

Abstract

Recent developments in the new spectroscopic technique concerning photochemical hole burning (PHB) and its possible application to the wavelength-multiplexed high density optical memory systems are reviewed. The basic concept of PHB is the site-selective optical bleaching usually observed in the solid systems doped with organic dye molecules at liquid helium temperature region. The molecular conditions and the fundamental mechanisms for the appearance of the holes are discussed in relation to the ordinary photochromic molecules. The review also includes discussions on the present research activities on PHB materials for future optical storage systems.

DOI
10.1380/jsssj.8.82

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Recent developments in the new spectroscopic technique concerning photochemical hole burning (PHB) and its possible application to the wavelength-multiplexed high density optical memory systems are reviewed. The basic concept of PHB is the site-selective optical bleaching usually observed in the solid systems doped with organic dye molecules at liquid helium temperature region. The molecular conditions and the fundamental mechanisms for the appearance of the holes are discussed in relation to the ordinary photochromic molecules. The review also includes discussions on the present research activities on PHB materials for future optical storage systems.
Photochemical hole burning (PHB) is a topic of attracting increasing interest from spectroscopic viewpoints as well as from the practical prospects for ultra-high-density frequency-domain optical storage. Recent advances in PHB study are reviewed mainly focusing on the effects of chemical structure of guest ions and molecules as well as host matrices on the efficiency of hole formation and its temperature dependence, low energy excitation modes and Debye-Waller factors in amorphous matrices, and the mechanism of photon-gated PHB.
(1) Photochemical Hole Burning (PHB) has a possibility to offer us an optical memory with ultra-high data storage density of more than 1011 bits/cm2 theoretically1). Such high data density can be achieved by multiplexing the information additional wavelength dimension besides the x-y spatial domain. The multiplexing of the information is realized by burning a sequence of narrow spectral holes as signals in the spectrum of a PHB material. Then the degree of information multiplexing depends on the degree of the multiple holes in the spectrum. The most essential subject for PHB memory is how densely and how many multiple holes can be formed without any interaction between any two holes.
Persistent spectral hole-burning (PHB) is a phenomenon that allows an additional dimension, the frequency at which spectral holes are written, to be used to encode digital data. PHB can be used to store a large number of bits of information in the volume irradiated by a focused laser beam, leading to a possible future storage technology, frequency domain optical storage. A large number of photochemical and photophysical mechanisms have led to the production of spectral holes; a wealth of information has been learned about host-guest interactions, dephasing, and solid-state photochemistry at low temperatures. The general structure of a frequency domain optical store places a set of constraints on the engineering of such a system as well as on the materials used as recording media. The dynamics of the hole-burning process are crucial; for monophotonic mechanisms in particular, a set of stringent constraints can be derived that limit the applicability of this class of materials. Recent discoveries of two-color, photon-gated hole-burning offer special promise for nondestructive reading and improved performance.
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)