Optical nonlinearities of Au nanoparticles and Au/Ag coreshells

Jae Tae Seo, Qiguang Yang, Wan-Joong Kim, Jinhwa Heo, Seong-Min Ma, Jasmine Austin, Wan Soo Yun, Sung Soo Jung, Sang Woo Han, Bagher Tabibi, Doyle Temple
Optics Letters 2009 February 1, 34 (3): 307-9
Au nanoparticles exhibited both negative and positive nonlinear absorptions with ground-state plasmon bleaching and free-carrier absorption that could be origins of the saturable and reverse-saturable optical properties. Au/Ag coreshells displayed only positive nonlinear absorption and reverse-saturable optical properties as a function of excitation intensity at the edge of surface-plasmon resonance, which implies no ground-state plasmon bleaching and the existence of two-photon absorption.

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