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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 18, Iss. 11 — Nov. 1, 2001
  • pp: 1722–1731

Optically induced anisotropy of third-order susceptibility in azo-dye polymers

Victor M. Churikov and Chia-Chen Hsu  »View Author Affiliations


JOSA B, Vol. 18, Issue 11, pp. 1722-1731 (2001)
http://dx.doi.org/10.1364/JOSAB.18.001722


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Abstract

Near-resonant optical pumping is applied for encoding the anisotropy of third-order susceptibility χ<sup>(3)</sup> in a Disperse Red 1 poly (methyl methacrylate) polymer thin film. The encoding process involves one- or two-photon excitation that results in <i>trans–cis</i> isomerization of azo molecules. Third-harmonic generation from the sample is used to probe the χ<sup>(3)</sup> anisotropy. We demonstrate large reversible variations of the third-harmonic generation (several times in intensity) in a sample pumped by the second harmonic of a Nd:YAG laser or a cw He–Cd laser. A microscopic model, which includes mechanisms for angular hole burning and molecular reorientation, is presented. The model is in good qualitative agreement with the experimental results.

© 2001 Optical Society of America

OCIS Codes
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials
(310.6860) Thin films : Thin films, optical properties

Citation
Victor M. Churikov and Chia-Chen Hsu, "Optically induced anisotropy of third-order susceptibility in azo-dye polymers," J. Opt. Soc. Am. B 18, 1722-1731 (2001)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-18-11-1722


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References

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