Nonlinear Dynamics of Ultrashort Long-Range Surface Plasmon Polariton Pulses in Gold Strip Waveguides
Nonlinear Dynamics of Ultrashort Long-Range Surface Plasmon Polariton Pulses in Gold Strip Waveguides
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DOI：
10.1021/acsphotonics.6b00509
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发表时间：
2016-12-01
期刊：
影响因子：
7
通讯作者：
Lavrinenko, Andrei
中科院分区：
文献类型：
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作者：
Lysenko, Oleg;Bache, Morten;Lavrinenko, Andrei
我们从理论和实验上研究了超短长程表面等离子激元在金条形波导中的非线性传输。的非线性吸收的波导中的等离子体激元模式的测量与飞秒脉冲揭示了强烈的依赖性的三阶非线性极化率的金芯上的脉冲持续时间和层厚度。基于非线性薛定谔方程，建立了三阶非线性极化率随脉冲宽度变化的综合模型。该模型考虑了金的自由电子的固有延迟（非瞬时）非线性以及金膜的厚度，并进行了实验验证。所得结果对于活性等离子体和纳米光子元件的开发具有重要意义。
We study experimentally and theoretically nonlinear propagation of ultrashort long-range surface plasmon polaritons in gold strip waveguides. The nonlinear absorption of the plasmonic modes in the waveguides is measured with femtosecond pulses revealing a strong dependence of the third-order nonlinear susceptibility of the gold core on the pulse duration and layer thickness. A comprehensive model for the pulse duration dependence of the third-order nonlinear susceptibility is developed on the basis of the nonlinear Schrodinger equation for plasmonic mode propagation in the waveguides. The model accounts for the intrinsic delayed (noninstantaneous) nonlinearity of free electrons of gold as well as the thickness of the gold film and is experimentally verified. The obtained results are important for the development of active plasmonic and nanophotonic components.