Controlling surface plasmon polaritons at femtosecond timescales on an aluminum-coated grating
Controlling surface plasmon polaritons at femtosecond timescales on an aluminum-coated grating
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DOI：
10.1063/1.4973860
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发表时间：
2017-01-09
影响因子：
4
通讯作者：
Chen, Jie
中科院分区：
文献类型：
--
作者：
Wang, Kuidong;Chen, Long;Chen, Jie
表面等离子体激元的飞秒光控制为高速等离子体激元开关的发展提供了一条有效的途径。然而，超快等离子体激元调制的机制尚不清楚。利用时间分辨光泵浦探测技术，在表面等离子体共振（SPR）条件下，通过频率简并实验，在镀铝光栅上获得了开关时间小于100 fs的超快等离子体调制。我们发现，高速等离子体激元调制主要是由于光脉冲和SPP脉冲的相干非线性相互作用，结合SPR和非SPR条件下的简并测量和非简并实验。实验测量的开关时间的范围内的激光脉冲宽度和理论上估计最终受到限制的等离子体激元阻尼时间。出版社：AIP Publishing
Femtosecond optical control of surface plasmon polaritons (SPPs) has paved an efficient way for the development of high-speed plasmonic switches. However, the mechanism of the ultrafast plasmonic modulation is unclear. Here, using time-resolved optical pump-probe technique, we obtained an ultrafast plasmonic modulation with a sub-100-fs switching time on an aluminum-coated grating in frequency degenerate experiments at the surface plasmon resonance (SPR) condition. We found that the high-speed plasmonic modulation primarily results from the coherent nonlinear interaction of the optical and SPP pulses, combining degenerate measurements at both SPR and non-SPR conditions and non-degenerate experiments. The switching time was measured experimentally with a range of laser pulse widths and estimated theoretically to be eventually limited by the plasmon damping time. Published by AIP Publishing.