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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 14, Iss. 7 — Jul. 1, 1997
  • pp: 1625–1631

Cancellation of photoinduced absorption in metal nanoparticle composites through a counterintuitive consequence of local field effects

David D. Smith, George Fischer, Robert W. Boyd, and Don A. Gregory  »View Author Affiliations


JOSA B, Vol. 14, Issue 7, pp. 1625-1631 (1997)
http://dx.doi.org/10.1364/JOSAB.14.001625


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Abstract

By applying the Maxwell Garnett model to gold nanoparticles in water we deduce a value of Im χi(3)=1.1×10-7 esu for the imaginary part of the cubic susceptibility for gold corresponding to a Fermi smearing mechanism. We also demonstrate a sign reversal in the nonlinear absorption for gold particles in 1, 1, 3, 3, 3, 3-hexamethylindotricarbocyanine iodide. Although the imaginary part of χ(3) is positive for each component by itself, remarkably the imaginary part of χ(3) is negative for the colloid as a whole. We show that the nonlinearity of the host must be considered and that the sign reversal in χ(3) is a result of the fact that at the surface plasmon resonance the local field factor has an imaginary component that arises from a phase shift between the applied field and the local field inside the particle.

© 1997 Optical Society of America

Citation
David D. Smith, George Fischer, Robert W. Boyd, and Don A. Gregory, "Cancellation of photoinduced absorption in metal nanoparticle composites through a counterintuitive consequence of local field effects," J. Opt. Soc. Am. B 14, 1625-1631 (1997)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-14-7-1625


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