THE EFFECTS OF DIFFERENT INTERFACIAL ENVIRONMENTS ON THE OPTICAL NONLINEARITY OF NANOMETER-SIZED CDO ORGANOSOL

The third-order optical nonlinearity chi((3)) of nanometer-sized CdO w ith different interfacial environments has been measured using the Z-s can technique. The real and imaginary parts of chi(3) at 800 nm have b een determined to be: -1.55 x 10(-16) m(2)/W and 0.91 cm/GW for CdO-CT AB (cetyltrimethyl ammonium bromide) organosol, and -6.97x10(-16) m(2) /W and 8.64 cm/GW for CdO-DBS (dodecylbenzene sulfonate) organosol. Or igins of the optical nonlinearity and the effects of the interfacial c onditions have been discussed. The optical Stark effect (OSE) and surf ace trapped states are the possible origins of the observed optical no nlinearity. The possible enhancement of optical nonlinearity of nanopa rticles by intentional interfacial modification is suggested. (C) 1997 American Institute of Physics.