Independent light-trapping cavity for ultra-sensitive plasmonic sensing
Independent light-trapping cavity for ultra-sensitive plasmonic sensing
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DOI：
10.1063/1.4893275
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发表时间：
2014-08-11
影响因子：
4
通讯作者：
Delaunay, Jean-Jacques
中科院分区：
文献类型：
--
作者：
Ho, Ya-Lun;Huang, Li-Chung;Delaunay, Jean-Jacques
研究了一种捕获光的独立等离子体腔结构的传感特性。腔结构通过在每个独立的腔中产生自包含的光涡来捕获光，而没有光的泄漏或传播；因此，在反射光谱中获得了强烈而尖锐的共振凹陷。在波长较短的高阶等离子体腔模中，在相互独立的腔体中产生多个光涡，实现了从可见光到近红外的大范围共振。与传输表面等离子体共振相比，等离子体腔模在独立腔中的共振不依赖于光的入射角的变化。这种独立腔结构通过简单的工艺制作，实验表明它具有高灵敏度(每个折射率单位大于1500 nm)和优值系数大于20。(C)2014 AIP出版有限责任公司。
The sensing characteristics of an independent-plasmonic-cavity structure that traps light were investigated. The cavity structure traps light by generating self-contained optical vortices in each independent cavity without leakage or propagation of the light; therefore, strong and sharp resonance dips are obtained in a reflectance spectrum. Multiple optical vortices are generated in the independent cavities in higher-order plasmonic cavity modes at shorter wavelengths, realizing the resonance in a wide range from visible to near-infrared. Compared to the propagating surface plasmon resonance, the resonance of plasmonic cavity mode in the independent cavity does not depend on variation of the incident angle of light. The independent-cavity structure was fabricated by a simple process, and it experimentally demonstrated a high sensitivity (above 1500 nm per refractive index unit) and a figure of merit above 20. (C) 2014 AIP Publishing LLC.