Spectrally resolved third-order nonlinearities in polydiacetylene microcrystals: Influence of particle size

R. Rangel-Rojo, S. Yamada, H. Matsuda, H. Kasai, H. Nakanishi, A. K. Kar, B. S. Wherrett

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The on- and near-resonant third-order nonlinear optical response of polydiacetylene microcrystals in suspension was studied by the Z-scan technique with tunable picosecond pulses. The absorptive and refractive contributions to the excitonic-dominated nonlinearity were fully resolved at several wavelengths. Microcrystals of two different average sizes were studied, and a comparison of their nonlinear coefficients was made. A three-level model for the nonlinear response is presented that shows good agreement with the experimental data. © 1998 Optical Society of America.

Original languageEnglish
Pages (from-to)2937-2945
Number of pages9
JournalJournal of the Optical Society of America B: Optical Physics
Volume15
Issue number12
Publication statusPublished - Dec 1998

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