Reduced damping of surface plasmon polaritons on silicon with intense femtosecond laser pulse
Reduced damping of surface plasmon polaritons on silicon with intense femtosecond laser pulse
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DOI：
10.7567/1347-4065/ab13db
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发表时间：
2019-05-01
影响因子：
1.5
通讯作者：
Hagiya, Masato
中科院分区：
文献类型：
--
作者：
Miyaji, Godai;Hagiya, Masato
使用强p偏振100飞秒激光脉冲，在空气中测量了硅光栅的反射率作为入射角的函数。观察到角度相关的反射率在特定入射角处突然减小以产生急剧下降，这表示在光栅上诱导的表面等离子体共振（SPR）。我们已经发现，下降的尖锐度随着激光能量密度的增加而增加。实验结果表明，随着激光能量密度的增加，表面自由电子密度增加，等离子体阻尼减小，表面等离子体共振增强。计算的反射率再现以及在下降的锐度增加，增加在硅光栅表面的电子密度。(C)2019日本应用物理学会
Using intense p-polarized 100-femtosecond laser pulses, the reflectivity of a silicon grating was measured in air as a function of the incident angle. The angular dependent reflectivity was observed to abruptly decrease to create a sharp dip at a specific incident angle, representing the surface plasmon resonance (SPR) induced on the grating. We have found that the sharpness of the dip increases with increasing the laser fluence. The experimental results show that the increase in the laser fluence produces a higher density of free electrons in the surface and decreases the plasmon damping to enhance the SPR. The calculated reflectivity reproduces well the increase in the dip sharpness with increasing the electron density in the silicon grating surface. (C) 2019 The Japan Society of Applied Physics