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Enhanced Nonlinear Optical Response of Coated Nanoparticles

Published online by Cambridge University Press:  21 February 2011

N. Kalyaniwalla ,
J.W. Haus ,
M.H. Birnboim ,
R. Inguva  and
W.P. Ma
N. Kalyaniwalla
Affiliation:
Rensselaer Polytechnic Institute, Physics Dept., Troy, NY 12180-3590
J.W. Haus
Affiliation:
Rensselaer Polytechnic Institute, Physics Dept., Troy, NY 12180-3590
M.H. Birnboim
Affiliation:
Rensselaer Polytechnic Institute, Dept. of M. E., A. E. and M., Troy, NY 12180-3590
R. Inguva
Affiliation:
University of Wyoming, Physics Dept., Laramie, WY
W.P. Ma
Affiliation:
Rensselaer Polytechnic Institute, Dept. of M. E., A. E. and M., Troy, NY 12180-3590
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Abstract

We study coated, nanometer-size, ellipsoidal particles that have a semiconductor or polymer core surrounded by a metal coating. We predict that composite materials containing these particles will have much larger enhancement of the nonlinear optical response than had previously been found by using semiconductor colloid suspensions or semiconductor - doped glasses. The enhancement is due to the surface plasmon resonance from the metal dielectric constant that increases the local field in the core material. The frequency of the resonance and the enhancement depend upon the particle shape and the coating thickness, as well as on the specific materials.

Also, we predict intrinsic optical bistability in these new materials and show that the threshold intensity for optical bistability can be greatly reduced by using the coated particles. We predict a switching intensity of silver coated GaAs particles below 100W/cm2

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 164: Symposium H – Materials Issues in Microcrystalline Semiconductors , 1989 , 283
Copyright
Copyright © Materials Research Society 1990

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