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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Extraordinary optical transmission throughmetal films with subwavelength holes and slits
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Extraordinary optical transmission throughmetal films with subwavelength holes and slits

机译：具有亚波长孔和狭缝的金属膜的非凡光学传输

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摘要

Continuous films of metals like gold and silver with a thickness of a few tens of nanometres have poor transmission for visible and infrared light. However, the same films become largely transparent when the transmission is mediated by coupled surfaceplasmon polaritons on the two surfaces of the film. Likewise, it is expected that optical transmission through a hole in an opaque metal film would be negligible if the size of the hole is much smaller than the wavelength of the incident radiation. Contrary to this, it was found a few years ago that opaque metal films perforated with a periodic array of subwavelength holes exhibit large transmission at certain wavelengths. Such extraordinary optical properties of the metal films have attracted much attention in recent years. They have led to several proposals and demonstrations of nanophotonic applications in a wide range of areas such as microscopy, spectroscopy, optoelectronics, optical data storage, biochemical sensing and so on. Also, extensive effort has been made to elucidate the mechanisms of efficient light energy transfer across metal films with arrays of subwavelength apertures like holes and slits. Despite this effort, not all aspects of the underlying physics of the phenomena are fully understood yet. Here, we provide a short review of the various concepts put forth to explicate the large transmission of light across continuous metal films and films with subwavelength apertures.
机译：金属（例如金和银）的连续膜（厚度为几十纳米）对于可见光和红外光的透射率很差。但是，当透射是通过膜的两个表面上的耦合表面等离激元极化子介导的时，相同的膜基本上变得透明。同样，可以预期的是，如果孔的尺寸远小于入射辐射的波长，则通过不透明金属膜中的孔的光传输将可忽略不计。与此相反，几年前发现，不透明的金属膜上打有周期性的亚波长孔阵列，在某些波长下显示出较大的透射率。近年来，金属膜的这种非凡的光学性能引起了很多关注。他们导致了在纳米显微镜的广泛应用领域的一些建议和演示，例如显微镜，光谱学，光电子学，光学数据存储，生化传感等。而且，已经做出大量努力来阐明在具有孔和缝隙等亚波长孔阵列的金属膜上进行有效的光能转移的机制。尽管付出了这些努力，但尚未完全理解现象的基本物理学的所有方面。在这里，我们简要介绍了各种概念，以阐明光在连续金属膜和具有亚波长孔径的膜之间的大透射率。

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