The investigation of nonlinear optical characteristics of ethanol solution doped with silver nanoparticles is presented. A large thermal-induced third-order nonlinear refractive index up to -1.94110<sup>?7</sup> cm<sup>2</sup>/W is obtained from the mixed solution under 488-nm continue wave (CW) laser irradiation, which may result from surface plasmon resonance (SPR) enhancement effect of silver nanoparticles as well as high thermo-optic coefficient and low thermal conductivity of ethanol. Obvious spatial self-phase modulation and influence of thermal-induced negative lens effect are observed when a beam propagates through this solution, indicating promising applications such as optical limiting, beam flattening, and so on.
© 2009 Chinese Optics Letters
Zhengle Mao, Lingling Qiao, Fei He, Yang Liao, Chen Wang, and Ya Cheng, "Thermal-induced nonlinear optical characteristics of ethanol solution doped with silver nanoparticles," Chin. Opt. Lett. 7, 949-952 (2009)