诺共振
折射率
功勋
光学
表面等离子共振
等离子体子
材料科学
栅栏
局域表面等离子体子
表面等离子体子
严格耦合波分析
共振(粒子物理)
光电子学
衍射光栅
物理
纳米颗粒
纳米技术
粒子物理学
作者
Guozhen Li,Yang Shen,Guoqing Xiao,Jin Chen
出处
期刊:Optics Express
[The Optical Society]
日期:2015-03-31
卷期号:23 (7): 8995-8995
被引量:54
摘要
The detection of minuscule changes in the local refractive index by localized surface plasmon resonances (LSPRs), carried by metal nanostructures, has been used successfully in applications such as real-time and label-free detection of molecular binding events. However, localized plasmons demonstrate 1-2 orders of magnitude lower figure of merit (FOM) compared with their propagating counterparts. Here, we propose and experimentally demonstrate a high-performance refractive index sensor based on a structure of double-layered metal grating (DMG) with an FOM and FOM* reaching 38 and 40 respectively under normal incidence. Such a high FOM and FOM* arise from a result of a sharp fano resonance, which is caused by the coherent interference between the LSPR from the individual top gold stripes and Wood's anomaly (WA). Moreover, a small conformal decay length of ~68 nm is determined in DMG, indicating that the DMG is a promising candidate for label-free biomedical sensing.
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