期刊
OPTICS LETTERS
卷 39, 期 8, 页码 2274-2277出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.39.002274
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资金
- Canada Excellence Research Chairs (CERC) program
- US Defense Threat Reduction Agency-Joint Science
- Technology Office for Chemical and Biological Defense [HDTRA1-10-1-0025]
We observe experimentally the self-phase modulation of a surface plasmon-polariton (SPP) propagating along a gold film bounded by air in a Kretschmann-Raether configuration. Through analyzing the power dependence of the reflectance curve as a function of the incidence angle, we characterize the complex-valued nonlinear propagation coefficient of the SPP. Moreover, we present a procedure that can further extract the complex value of the third-order nonlinear susceptibility of gold from our experimental data. Our work provides direct insights into nonlinear control of SPPs utilizing the nonlinearity of metals, and serves as a practical method to measure the complex-valued third-order nonlinear susceptibility of metallic materials. (C) 2014 Optical Society of America
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