Abstract
ABSTRACTQuantized 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.
Published Version
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