Enhanced extraordinary optical transmission (EOT) through arrays of bridged nanohole pairs and their sensing applications.
Enhanced extraordinary optical transmission (EOT) through arrays of bridged nanohole pairs and their sensing applications.
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DOI：
10.1039/c4nr01001a
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发表时间：
2014-06
期刊：
影响因子：
6.7
通讯作者：
W. Yue;Zhihong Wang;Yang Yang-Yang;Jingqi Li;Ying Wu;Longqing Chen;B. Ooi;Xianbin Wang;Xixiang Zhang
中科院分区：
文献类型：
--
作者：
W. Yue;Zhihong Wang;Yang Yang-Yang;Jingqi Li;Ying Wu;Longqing Chen;B. Ooi;Xianbin Wang;Xixiang Zhang
研究了金纳米孔阵列在可见光到近红外光谱范围内的超光传输。通过对纳米孔的桥接，发现在纳米孔之间的狭缝处集中了电磁场，从而改善了EOT效应。这些纳米孔对的几何形状和孔的间距影响了透射强度和共振波长。改变这些纳米孔对的几何形状，从三角形到圆形再到正方形，会增加透射强度和红移共振波长。研究了电桥纳米空穴对作为等离子体传感器的性能。通过不同表面等离子体共振透射光谱，桥接纳米孔对能够区分甲醇、橄榄油和显微镜浸泡油。数值模拟结果与实验结果吻合较好。
Extraordinary optical transmission (EOT) through arrays of gold nanoholes was studied with light across the visible to the near-infrared spectrum. The EOT effect was found to be improved by bridging pairs of nanoholes due to the concentration of the electromagnetic field in the slit between the holes. The geometrical shape and separation of the holes in these pairs of nanoholes affected the intensity of the transmission and the wavelength of resonance. Changing the geometrical shapes of these nanohole pairs from triangles to circles to squares leads to increased transmission intensity as well as red-shifting resonance wavelengths. The performance of bridged nanohole pairs as a plasmonic sensor was investigated. The bridged nanohole pairs were able to distinguish methanol, olive oil and microscope immersion oil for the different surface plasmon resonance in transmission spectra. Numerical simulation results were in agreement with experimental observations.