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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 6, Iss. 4 — Apr. 1, 1989
  • pp: 787–796

Composite structures for the enhancement of nonlinear-optical susceptibility

A. E. Neeves and M. H. Birnboim  »View Author Affiliations


JOSA B, Vol. 6, Issue 4, pp. 787-796 (1989)
http://dx.doi.org/10.1364/JOSAB.6.000787


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Abstract

Calculations of the nonlinear-optical behavior are developed for model composites of nanospheres with a metallic core and nonlinear shell or with a nonlinear core and metallic shell suspended in a nonlinear medium. Optical phase conjugation is shown to be enhanced from each nonlinear region because the optical field can be concentrated in both the interior and the exterior neighborhoods of the particle and magnified at the surface-mediated plasmon resonance. For the model composite with a metallic core, a limited range of resonance tunability can be achieved by adjustment of shell thickness; the frequency range is dependent on the dielectric dispersion of the metal. For the composite with a metallic shell instead of a metallic core, this restriction is reduced so that tunability from ultraviolet to infrared can be attained. Enhancement of the phase-conjugate signal is calculated for the electrostrictive mechanism dominant in the microsecond time scale and for the electronic mechanism dominant in the picosecond time scale. Calculations based on the dielectric functions for gold and for aluminum indicate that phase-conjugate reflectivity enhancements of 108 can be achieved. The imaginary components of the composite dielectric functions are shown to limit the magnitude of the field enhancement at the surface-plasmon resonance and determine the absorption and figure of merit of the composite.

© 1989 Optical Society of America

History
Original Manuscript: October 21, 1988
Manuscript Accepted: January 6, 1989
Published: April 1, 1989

Citation
A. E. Neeves and M. H. Birnboim, "Composite structures for the enhancement of nonlinear-optical susceptibility," J. Opt. Soc. Am. B 6, 787-796 (1989)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-6-4-787


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