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Japanese Journal of Applied Physics

Photochemical Hole Burning of Quinone Derivatives

Eiji Yagyu, Tetsuya Nishimura, Motomu Yoshimura

Published Feb 1, 1992• 5 citations
Publisher

Abstract

Photochemical Hole Burning (PHB) has a potential storage density of more than 1011 bits/cm2 using the wavelength dimension. We have investigated increasing the number of holes by additional using the electric field. The holes were measured with high resolution double beam laser spectroscopy. Furthermore, we have demonstrated multiple hole formation using both dimensions, which shows the possibility of the formation of thousands of multiple hole.

DOI
10.1143/jjap.31.713

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Electric field effect on the persistent hole burning of quinone derivatives

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The capacity of optical memories can be enhanced by using extra dimensions to store the signals besides the spatial dimension. We have investigated the photochemical persistent hole burning (PHB) reaction in a series of quinone derivatives as the guest molecules. In wavelength dimension, we showed that 600 ultra-high multiple spectral holes can be recorded in a double layered system. To increase the multiplicity of spectral holes, we intended to use electric field as another dimension. We have investigated the influence of electric field effect (Stark effect) in the PHB reaction characteristics. We observed for the first time with the quinone derivative systems that the burnt holes were broadened and then diminished when the applied electric field was changed, and that they reappeared when the applied electric field was changed again to the initial value. Multiple hole formation in the electric field dimension and optical modulation by electric field were also achieved.

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Aug 6, 1996•0 citations
Photochemical Hole Burning (PHB) has a potential storage density of more than 1011 bits/cm2 using the wavelength dimension. We have investigated increasing the number of holes by additional using the electric field. The holes were measured with high resolution double beam laser spectroscopy. Furthermore, we have demonstrated multiple hole formation using both dimensions, which shows the possibility of the formation of thousands of multiple hole.
The capacity of optical memories can be enhanced by using extra dimensions to store the signals besides the spatial dimension. We have investigated the photochemical persistent hole burning (PHB) reaction in a series of quinone derivatives as the guest molecules. In wavelength dimension, we showed that 600 ultra-high multiple spectral holes can be recorded in a double layered system. To increase the multiplicity of spectral holes, we intended to use electric field as another dimension. We have investigated the influence of electric field effect (Stark effect) in the PHB reaction characteristics. We observed for the first time with the quinone derivative systems that the burnt holes were broadened and then diminished when the applied electric field was changed, and that they reappeared when the applied electric field was changed again to the initial value. Multiple hole formation in the electric field dimension and optical modulation by electric field were also achieved.
(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.
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.
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)