Large third-order optical nonlinearity realized in symmetric nonpolar carotenoids

Fujiwara, M., Yamauchi, K., Sugisaki, M., Yanagi, K., Gall, A., Robert, B., Cogdell, R.J. and Hashimoto, H. (2008) Large third-order optical nonlinearity realized in symmetric nonpolar carotenoids. Physical Review B, 78(16), p. 161101. (doi:10.1103/PhysRevB.78.161101)

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Publisher's URL: http://dx.doi.org/10.1103/PhysRevB.78.161101

Abstract

We show that a very large enhancement of third-order optical nonlinearity (gamma) of pi-conjugated molecules can be realized without a major redshift of the absorption spectrum that disturbs optical transparency in the visible region. By changing the number (n) of C=C bonds of beta carotene (n=11) from 7 to 15, a remarkable 3.4-fold increase in the gamma value was observed when n=15 relative to that of beta carotene. This enhancement of gamma mainly originates from three-photon resonance of a lowest optically allowed excited state. The controversial higher-lying essential state is not important for generating the large value of gamma

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cogdell, Professor Richard
Authors: Fujiwara, M., Yamauchi, K., Sugisaki, M., Yanagi, K., Gall, A., Robert, B., Cogdell, R.J., and Hashimoto, H.
Subjects:Q Science > QC Physics
College/School:College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
Journal Name:Physical Review B
Publisher:American Physical Society
ISSN:1098-0121
ISSN (Online):1550-235X

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