Optical nonlinearities of Au nanoparticles and Au/Ag coreshells.
Optical nonlinearities of Au nanoparticles and Au/Ag coreshells.
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DOI：
10.1364/ol.34.000307
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发表时间：
2009-02
期刊：
影响因子：
3.6
通讯作者：
Jaetae Seo;Qiguang Yang;W. Kim;Jinhwa Heo;Seongmin Ma;J. Austin;W. Yun;Sungsoo Jung;S. Han;B. Tabibi;D. Temple
中科院分区：
文献类型：
--
作者：
Jaetae Seo;Qiguang Yang;W. Kim;Jinhwa Heo;Seongmin Ma;J. Austin;W. Yun;Sungsoo Jung;S. Han;B. Tabibi;D. Temple
Au纳米颗粒表现出负和正的非线性吸收，基态等离子体漂白和自由载流子吸收可能是可饱和和反饱和光学性质的起源。Au/Ag核壳在表面等离子体共振边缘仅表现出正的非线性吸收和反饱和光学性质，说明没有基态等离子体漂白现象，存在双光子吸收.
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.