Direct observation of surface plasmon far field for regular surface ripple formation by femtosecond laser pulse irradiation of gold nanostructures on silicon substrates
Direct observation of surface plasmon far field for regular surface ripple formation by femtosecond laser pulse irradiation of gold nanostructures on silicon substrates
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DOI：
10.1063/1.3624925
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发表时间：
2011-08-08
影响因子：
4
通讯作者：
Obara, Minoru
中科院分区：
文献类型：
--
作者：
Obara, Go;Tanaka, Yuto;Obara, Minoru
我们直接观察到了金纳米球表面等离子体激元远场与入射到硅衬底上的激光之间的干涉波纹。我们用三维有限差分的时间域模拟方法解释了波纹的形成。纳米球是由于Mie散射而形成规则波纹的根源。我们提出了一种利用硅衬底上任意的金纳米结构来控制等离子体远场图案的新方法。以前形成的波纹不是规则的，而是波动的，因为它们是通过随机表面粗糙度产生的自组织过程非相干地形成的。波纹结构得到了很好的相干控制。(C)2011年美国物理研究所。[DOI：10.1063/1.3624925]
We have directly observed the interference ripple pattern between surface plasmon far field by gold nanosphere and the incident laser on silicon substrate. We explained the ripple formation using three-dimensional finite-difference time-domain simulation method. Nanosphere is an origin for regular ripple formation due to Mie scattering. We present a new method to control the plasmonic far-field pattern using an arbitrary gold nanostructure on the silicon substrate. Previously, the formed ripples were not regular but wavy because they were formed incoherently through the self organization process originating from the random surface roughness. The ripple structure was well controlled coherently. (C) 2011 American Institute of Physics. [doi:10.1063/1.3624925]