The Synthesis and Evaluation of Third-Order Optical Nonlinearities of Model Compounds Containing Benzothiazole, Benzimidazole and Benzoxazole Moieties.
Abstract
A series of model compounds containing benzothiazole benzimidazole and benzoxazole moieties were prepared and evaluated by femtosecond degenerate four-wave mixing techniques. Model compounds were evaluated as either solutions of various concentrations in tetrahydrofuran or as vacuum deposited fils. In general, the trend toward nonlinearity was directly related to structural variations since no one- or two-photon resonances were observed in the models despite the consideration of time-response behavior and concentration dependence. The following generalizations are afforded: (1) microscopic third- order nonlinearity rapidly increases with an increase in the effective conjugation length for a quasi-one-dimensional molecule; (2) incorporation of a sulfur containing heteroaroamic fused ring in the conjugated structure enhances nonlinearity; (3) imidazole N-linkages enhance third-order optical nonlinearity by virtue of the transition from a quasi-one-dimensional to a two dimensional delocalization of the electrons without sacrifice of optical transparency and solubility.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1991
- Accession Number
- ADA235622
Entities
People
- Bruce A. Reinhardt
- Chetan Jariwala
- James J. Kane
- Marek Samoć
- Marilyn R. Unroe
- Mark Prazak
- Mark Sinsky
- Mingtang Zhuo
- Paras Nath Prasad
- Robert C. Evers
Organizations
- Wright Laboratory