Tertiary non-linear optical material

Details Tertiary non-linear optical material Tertiary non-linear optical material

1995-01-26

1997-10-21

Ivy, C. Warren

Organic compounds -- part of the class 532-570 series

Organic compounds

Polycyclo ring system containing anthracene configured ring...

552234, 552236, 552238, 552239, 552243, 552258, 552261, 552297, 552298, 552295, 552300, C07C 5024, C07C 40703, C07C 5000

Patent

active

056798083

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This is the U.S. material phase of PCT/JP94/00177 filed Feb. 4, 1994.
The present invention relates to a novel organic non-linear optical material for manufacturing various devices using non-linear optical effects. More particularly, it relates to a tertiary non-linear optical material preferably employed in various devices used in the fields of super-high speed optical information processing or optical communication using tertiary non-linear optical effects.


BACKGROUND ART

The non-linear optical effect is, as expressed by the following equation (i), an optical effect that generates along with non-linearity occurred if a polarization P, which is induced by an electric field exerted within a crystal, is provided with second degree or higher degree terms. . X.sup.(n) E.sup.n (i) an electric field vector.
As a secondary non-linear optical phenomenon observed on the non-linear optical material, there are second harmonic generation, optical rectification, optical mixing, parametric amplification, Pockels effect and the like. As the tertiary non-linear optical phenomenon, there are third harmonic generation, optical bistability, Kerr effect and the like.
If the optical bistability is employed as a tertiary optical phenomenon, it is possible to obtain a device which can be a key device for the future optical information processing systems such as a high-speed light switch and an optical bistable device. Accordingly, research and development of non-linear optical materials has recently been prevalent.
As a non-linear optical material showing optical bistability, there are known a semi-conductor with multiple-quantum well structure, a glass material wherein super-fine particles of semi-conductors (e.g. CuCl, CdS) are dispersed, an organic compound with .pi.-electron conjugated system, Optics", 24, (11), 1989!.
Among those, the semi-conductors and the glass material, both of which employ non-linear optical effect due to optical absorption, exhibit a speed of response ranging from 10.sup.-8 to 10.sup.-11 seconds, which is too slow to use as a device for super-high speed information processing.
On the other hand, the organic compound utilizes non-linear optical effect due to pure electronic polarization, not due to optical absorption nor molecular rearrangement. Therefore, it exhibits a high speed of response ranging from 10.sup.-12 to 10.sup.-14 seconds, thus being a prospective material of a device used for super-high speed information processing.
As an organic compound with the tertiary non-linear optical effect, there are known a polymer material such as polydiacetylene, polyacetylene, polybenzothiazole; a low molecular weight compound with inner-molecular charge transfer structure such as an azo pigment; a transition-metal complex such as a metallic phthalocyanine, among others.
However, a tertiary non-linear susceptibility X.sup.(3) for the known organic compounds with .pi.-electron conjugate system is located in smaller values, i.e. in a range from 10.sup.-9 to 10.sup.-11 esu, so that a strong input optical intensity is required to operate a formed device. It is therefore impossible to employ a semi-conductor laser with about 10 mW as a light source, thus being unsuitable for practical use.
Meanwhile, there are no definite molecular design guideline for increasing the tertiary non-linear susceptibility X.sup.(3) in the organic compounds.
It is an object of the present invention to provide a tertiary non-linear optical material which enables the co-existence of large tertiary non-linear optical susceptibility and high speed of response.


DISCLOSURE OF THE INVENTION

The tertiary non-linear optical material of the present invention is a quinone derivative expressed by any one of the general formulas: ##STR3## wherein R.sup.1 is an electron-donating group; R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are the same or different, and are hydrogen atoms or organic substituents containing the electron-donating group, or the formula: ##STR4##
The inventors studies the organic compounds with .pi.-e

REFERENCES:
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patent: 3960751 (1976-06-01), Moriyama et al.
patent: 4363743 (1982-12-01), Moeller et al.
patent: 4405211 (1983-09-01), Harrison et al.
patent: 4464282 (1984-08-01), Harrison et al.
patent: 5409797 (1995-04-01), Hosoi et al.
Database Inspec Inspec No. 5030995, Matsuoka M. et al "Molecular design of quinoid dyes for 3rd order NLO materials".
European Search Report.

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