Nonlinear Absorption Properties of Spherical Gold Colloidal Nanoparticles

Abstract:

Spherical gold colloidal nanoparticles were prepared used traditional liquid phase method and the corresponding nonlinear absorption properties were investigated by open aperture Z-scan technique using 8 ns laser pulses of 532 nm. The gold colloidal nanoparticles exhibited a transform from saturable absorption (SA) to reverse saturable absorption (RSA) at relatively higher irradiation intensities. The SA behavior presumably owes to the bleach of ground-state surface plasmon resonance (SPR) absorption, while the RSA might result from high excited-stated free carrier absorption.

• Periodical: Advanced Materials Research (Volumes 476-478)
• Pages: 923-927
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.476-478.923
• Online since: February 2012
• Authors: Chan Zheng, Xiao Yun Ye, Xue Qing Xiao
• Keywords: Gold Nanoparticles (GNP), Nonlinear Optical, Reverse Saturable Absorption, Saturable Absorption

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