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Third-Order Optical Nonlinearities of Quantized CdS and Metal Ultrafine Particles Co-Dispersed in Polymer Matrices – Surface Modification Effect

Published online by Cambridge University Press:  28 February 2011

Hiroshi Yao  and
Toyoharu Hayashi
Hiroshi Yao
Affiliation:
Central Research Institute, Mitsui Toatsu Chemicals Inc., 1190 Kasama-cho, Sakae-ku, Yokohama 247, Japan
Toyoharu Hayashi
Affiliation:
Central Research Institute, Mitsui Toatsu Chemicals Inc., 1190 Kasama-cho, Sakae-ku, Yokohama 247, Japan
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Abstract

Quantized CdS particles of about 60 A in diameter were prepared by an organo-sol method in the presence of PVP (poly(N-vinyl-2-pyrrolidone)), and this new method could make the CdS ultrafine particles densely dispersed in PHEMA (poly(2-hydroxyethyl methacrylate)) host films. The values of | x(3) |/α (third-order optical nonlinear susceptibility per unit absorption coefficient) were obtained (2.0 × 10-10 esu· cm at 460 nm and 2.7 × 10-10esu · cm at 470 nm) using a nanosecond DFWM technique. An enhancement of non-linearity was observed for the first time when Ag particles or Ag+ ion were co-dispersed with the CdS particles in small amounts. The addition of 8.57 wt% Ag particles, or 4.28 wt% Ag+ ion in the ratio to CdS made | x(3) |/α enhanced to be 3.9 × 10-10 esu· cm, or 4.1 × 10-10 esu· cm, respectively. The surface modification by the formation of Ag2S on the surface of CdS colloids is believed to be responsible for this enhancement.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 283: Symposium F – Microcrystalline Semiconductors–Materials Science and Devices , 1992 , 847
Copyright
Copyright © Materials Research Society 1993

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References

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