Self-focusing of femtosecond surface plasmon polaritons.
Self-focusing of femtosecond surface plasmon polaritons.
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DOI：
10.1364/oe.21.001121
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发表时间：
2013-01
期刊：
影响因子：
3.8
通讯作者：
Andreas Pusch;I. Shadrivov;O. Hess;Y. Kivshar
中科院分区：
文献类型：
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作者：
Andreas Pusch;I. Shadrivov;O. Hess;Y. Kivshar
采用时域有限差分数值方法研究了飞秒脉冲在非线性金属-介质等离子体波导结构中的传输。由于正常色散的介电介质的类克尔非线性离焦，观察到等离子体激元脉冲的自聚焦。我们比较了等离子体激元脉冲沿着单个金属-电介质界面的非线性传播与金属-电介质-金属缝隙波导内的传播，并观察到非线性效应对于单个表面更明显，其中较长的传播长度可以补偿较低的场限制。
We study the propagation of femtosecond pulses in nonlinear metal-dielectric plasmonic waveguiding structures by employing the finite-difference time-domain numerical method. Self-focusing of plasmon pulses is observed for defocusing Kerr-like nonlinearity of the dielectric medium due to normal dispersion. We compare the nonlinear propagation of plasmon pulses along a single metal-dielectric interface with the propagation within a metal-dielectric-metal slot waveguide and observe that nonlinear effects are more pronounced for the single surface where longer propagation length may compensate for lower field confinement.