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The two-photon absorption saturation process in an Au nanoparticle array

Wang Kai Long Hua Fu Ming Zhang Li-Chao Yang Guang Lu Pei-Xiang

The two-photon absorption saturation process in an Au nanoparticle array

Wang Kai, Long Hua, Fu Ming, Zhang Li-Chao, Yang Guang, Lu Pei-Xiang
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Publishing process
  • Received Date:  01 June 2010
  • Accepted Date:  28 June 2010
  • Published Online:  15 March 2011

The two-photon absorption saturation process in an Au nanoparticle array

  • 1. Wuhan National Laboratory for Optoelectronics Division of Laser Science and Technology, Huazhong University of Science and Technology, Wuhan 430074,China

Abstract: The triangular Au nanoparticle array of size 37 nm was fabricated on a quartz substrate using nanosphere lithography. By performing the Z-scan method with femtosecond laser (800 nm, 50 fs), the optical nonlinearity of the Au nanoparticle array was determined. The results showed an intensity-related two-photon absorption saturation processes. As the excitation intensity increases, the nonlinear absorption changes from two-photon absorption to saturated absorption, while the nonlinear refraction exhibits self-defocusing effect. The one- and two-photon figures of merit, W=7.5 and T=0.12, were obtained, validating a high efficiency nonlinear material for all-optical switching.

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