Hyper-Rayleigh scattering (HRS) technique has been used to study second-order nonlinear optical (NLO) properties of some centrosymmetric metal and semiconductor nanoparticles. All the samples display big "per particle" first hyperpolarizabilities 'beta'_(par). For centrosymmetric particles the contributions of multipolar radiations are very important to their second-order NLO responses. The metal nanoparticles show 'beta'_(par) two orders greater than that of the semiconductor ones, which can be explained by the enhancement of surface plasma resonance (SPR). It also reveals that the HRS signals are very sensitive to metal nanoparticles' aggregation.
© 2005 Chinese Optics Letters
(190.3970) Nonlinear optics : Microparticle nonlinear optics
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(270.4180) Quantum optics : Multiphoton processes
(300.6410) Spectroscopy : Spectroscopy, multiphoton
Xin Wang, Yu Zhang, Gang Wang, Chunxiu Zhang, Degang Fu, Yaochun Shen, Zuhong Lu, Yiping Cui, Shizuyasu Ochiai, Yoshiyuki Uchida, Kenzo Kojima, and Asao Ohashi, "Second-order nonlinear optical properties of centrosymmetric nanoparticles studied by hyper-Rayleigh scattering (HRS) technique," Chin. Opt. Lett. 3, S125-S127 (2005)