Surface plasmons enhance optical transmission through subwavelength holes
Surface plasmons enhance optical transmission through subwavelength holes
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DOI：
10.1103/physrevb.58.6779
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发表时间：
1998-09-15
影响因子：
3.7
通讯作者：
Lezec, HJ
中科院分区：
文献类型：
--
作者：
Ghaemi, HF;Thio, T;Lezec, HJ
光学厚金属薄膜穿孔与周期性阵列的亚波长孔显示出特殊的传输特性。零阶透射光谱表现出明确的最大值和最小值的位置是由孔阵列的几何形状。我们表明，最小值是收集的伍德的异常，发生时，衍射光束成为切线的膜的轨迹，和最大值是表面等离子体激元（SP）的共振激发的结果。来自金属膜的两个表面的SP在色散图中是明显的，与照射的是金属膜的哪一侧无关，这表明两侧之间存在非常强的耦合。这导致波长选择性传输，其效率比亚波长孔的预期效率高约1000倍。
Optically thick metal films perforated with a periodic array of subwavelength holes show exceptional transmission properties. The zero-order transmission spectra exhibit well-defined maxima and minima of which the positions are determined by the geometry of the hole array. We show that the minima are the collection of loci for Wood's anomaly, which occurs when a diffracted beam becomes tangent to the film, and that the maxima are the result of a resonant excitation of surface plasmons (SP's). SP's from both surfaces of the metal film are apparent in the dispersion diagram, independent of which side of the him is illuminated, indicating an anomalously strong coupling between the two sides. This leads to wavelength-selective transmission with efficiencies that are about 1000 times higher than that expected for subwavelength holes.