Dielectric Thickness Detection Sensor Based on Metallic Nanohole Arrays

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• 作者：Shan Wu ; Pengfeng Guo ; Wanxia Huang ; Shoujun Xiao ; Yongyuan Zhu
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：August 11, 2011
• 年：2011
• 卷：115
• 期：31
• 页码：15205-15209
• 全文大小：838K
• 年卷期：v.115,no.31(August 11, 2011)
• ISSN：1932-7455

文摘

The enhanced optical transmission (EOT) and the enhanced fluorescence emission (EFE) of the metallic nanohole arrays have been widely studied. Here, the dielectric thickness detection sensor based on these two aspects has been investigated by changing the thickness of the SiO₂ layer deposited on the metal surface. We have demonstrated that the Wood anomaly transmission dip in the EOT is better for the dielectric layer thickness detection than the SPP transmission peak. Moreover, in the EFE, by measuring the change of fluorescence emission intensity with the thickness of SiO₂ layer, we have obtained higher thickness-detection sensitivity. These results indicate the potential application of metallic nanohole arrays in dielectric thickness detection biosensors.