Extraordinary optical transmission through sub-wavelength hole arrays
Extraordinary optical transmission through sub-wavelength hole arrays
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DOI：
10.1038/35570
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发表时间：
1998-02-12
期刊：
影响因子：
64.8
通讯作者：
Wolff, PA
中科院分区：
文献类型：
--
作者：
Ebbesen, TW;Lezec, HJ;Wolff, PA
以类似于控制固体中电子的方式使用和控制光子的愿望激发了人们对光的局部化、微腔量子电动力学和近场光学等主题的极大兴趣（1-6）。光操控的一个基本限制是小于入射光子波长的孔径的极低透射率。在探索金属薄膜中亚微米圆柱形孔的光学性质时，我们发现这种孔阵列显示出极不寻常的零级透射谱（其中入射光和检测光是共线的）波长大于阵列周期，超过该周期不发生衍射。在高达圆柱体直径十倍的波长处观察到透射的尖峰。在这些最大值处，传输效率可以超过1（当归一化到孔的面积时），这比标准孔径理论预测的大几个数量级。我们的实验提供了证据，证明这些不寻常的光学性质是由于光与周期性图案化金属膜表面上的等离子体激元-电子激发-的耦合，测量透射率随入射光角度的变化，得到了光子带图，这些发现可能在新型光子器件中得到应用。
The desire to use and control photons in a manner analogous to the control of electrons in solids has inspired great interest in such topics as the localization of light, microcavity quantum electrodynamics and near-field optics(1-6). A fundamental constraint in manipulating light is the extremely low transmittivity of apertures smaller than the wavelength of the incident photon, While exploring the optical properties of submicrometre cylindrical cavities in metallic films, we have found that arrays of such holes display highly unusual zero-order transmission spectra (where the incident and detected light are collinear) at wavelengths larger than the array period, beyond which no diffraction occurs, In particular, sharp peaks in transmission are observed at wavelengths as large as ten times the diameter of the cylinders. At these maxima the transmission efficiency can exceed unity (when normalized to the area of the holes), which is orders of magnitude greater than predicted by standard aperture theory, Our experiments provide evidence that these unusual optical properties are due to the coupling of light with plasmons-electronic excitations-on the surface of the periodically patterned metal film, Measurements of transmission as a function of the incident light angle result in a photonic band diagram, These findings may find application in novel photonic devices.