The third-order nonlinearities of PbS nano-belts have been investigated using the Z-scan technique with nanosecond laser pulses at 532 nm. The effect of the PbS semiconductor nano-belt size on the third-order optical nonlinearities and optical limiting properties was studied. We found that the nonlinear absorption and nonlinear refraction have not strict dependence on the nano-belt size under our investigated condition, but their optical limiting behavior is different. The optical limiting mechanism of materials is discussed.
© 2005 Chinese Optics Letters
(190.3970) Nonlinear optics : Microparticle nonlinear optics
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.5970) Nonlinear optics : Semiconductor nonlinear optics including MQW
Bei Cao, Yundong Zhang, Honggang Zhang, and Junjie Zhu, "Optical nonlinearities and optical limiting properties of PbS semiconductor nano-belts," Chin. Opt. Lett. 3, S248-S250 (2005)