Contribution of dipolar interactions to third-order nonlinear dielectric susceptibility of nanocomposites.
We consider an ensemble of identical semiconductor nanoparticles randomly embedded into dielectric matrix. The nanoparticles are polarized by the laser irradiation having linear polarization. The contribution of dipole-dipole interactions to third-order dielectric susceptibility is calculated by using mean random field method. It is shown that this contribution always has a negative sign, and it can be comparable with the values of optical nonlinearity observed experimentally.
Panov
Andrey V
AV
Institute for Automation and Control Processes, Far East Branch of Russian Academy of Sciences,5, Radio Street, Vladivostok, 690041, Russia. panov@iacp.dvo.ru