Enhanced optical transmission through asymmetric nanostructured gold films

Enhanced optical transmission through asymmetric nanostructured gold films
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通过不对称纳米结构金膜增强光学传输

DOI:
10.1364/josab.29.003377
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发表时间:
2012-12
影响因子:
1.9
通讯作者:
Xie, Changqing
Xie, Changqing
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Shi, Lina;Li, Hailiang;Du, Yuchan;Xie, Changqing

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我们研究了一种金结构的光学性质,该结构包括放置在薄金膜顶部的二维金纳米块阵列。我们观察到通过不对称纳米结构金薄膜的透射增强,这可以归因于当衬底指数大于衬底指数时,空气-金界面的表面等离子体(SP)模式泄漏到衬底。当衬底和上基材为同一介质时,上基材-金和金-衬底界面处的SPs相互作用强烈,激发出偶数和奇数SPs。此外,我们还研究了斜入射和电子带间跃迁对SP共振的影响。我们的研究结果为基于纳米结构的新型增强传输器件的工程设计提供了指导。
We investigate optical properties of a gold structure comprising a two-dimensional array of gold nanoblocks placed on top of a thin gold film. We observe enhanced transmission through asymmetric nanostructured gold films, which can be attributed to the surface plasmon (SP) mode at the air-gold interface leaking to the substrate when the substrate index is larger than the superstrate index. When the substrate and superstrate are the same dielectric, the SPs at both superstrate-gold and gold-substrate interfaces strongly interact with each other and even and odd SPs are then excited. In addition, we investigate effects of oblique incidence and electronic interband transition on SP resonances. Our results provide a guideline for engineering novel devices with enhanced transmission based on nanostructures.
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