New organic non-linear optical materials of stilbene and diphenylacetylene derivatives

✍ Scribed by Y. Wang; W. Tam; S.H. Stevenson; R.A. Clement; J. Calabrese

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 537 KB
• Volume: 148
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(88)80289-6

✦ Synopsis

We report a series of new optically non-linear organic molecules of stilbcne and diphenylacetylene derivatives. We have measured their powder second-harmonic generation efficiency and, in certain cases, the second-order molecular polarizability, jr. This series of molecules is characterized by: ( 1) very large non-linearity, (2) high probability of forming non-centrosymmetric crystal structures, and (3) polymorphism. A number of relatively weaker donors: methoxy, bromo, and iodo, have been identified as effective moieties to enhance the intrinsic molecular non-linearity. Using weak donors to prepare highly non-linear optical materials provides advantages of having better optical transparency and high probability of forming acentric structures.