Exceptional second‐order nonlinear optical susceptibilities of quinoid systems
作者:
S. J. Lalama,
K. D. Singer,
A. F. Garito,
K. N. Desai,
期刊:
Applied Physics Letters
(AIP Available online 1981)
卷期:
Volume 39,
issue 12
页码: 940-942
ISSN:0003-6951
年代: 1981
DOI:10.1063/1.92619
出版商: AIP
数据来源: AIP
摘要:
A new class of organic quinoid systems possessing intrinsically large, nonlinear second‐order optical susceptibilities has been developed based on theoretical calculations and dc‐induced second‐harmonic generation measurements of the molecular second‐order optical susceptibilities &bgr;. For one example, 2‐(4‐dicyanomethylenecyclohexa‐2, 5‐dienylidine)‐imidazolidine (DCNQI), &bgr;x= −240±60×10−30cm5/esu. The unusually large magnitude and sign originate from certain charge‐correlated features in the quinoid ground and excited states.
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