We propose a highly refractive index sensor based on plasmonic Bow Tie configuration. The sensitivity of the resonator design is enhanced by incorporating a nanowall (NW) in a modified Bow Tie design where sharp tips of V-junction are flattened. This approach provides high confinement of electric field distribution of surface plasmon polariton (SPP) mode in the narrow region of the cavity. Consequently, the effective refractive index (n_eff) of the mode increases and is highly responsive to the ambient medium. The sensitivity analysis of the SPP mode is calculated for six resonator schemes. The results suggest that the NW embedded cavity offers the highest mode sensitivity due to the large shift of effective index when exposed to a slight change in the medium refractive index. Moreover, the device sensitivity of the proposed design is approximated at 2300 nm/RIU which is much higher than the sensitivity of the standard Bow Tie configuration.

中文翻译：

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基于等离激元领结配置的高灵敏度折射率传感器

我们提出了一种基于等离子领结配置的高折射率传感器。通过在改进的Bow Tie设计中结合纳米壁（NW）来增强谐振器设计的灵敏度，在该设计中，V型结的尖锐尖端变平了。这种方法在腔体的狭窄区域中提供了表面等离子体激元极化（SPP）模式的电场分布的高度限制。因此，有效折射率（n _eff模式的）增大，并且对环境介质具有高度响应性。针对六个谐振器方案计算了SPP模式的灵敏度分析。结果表明，当暴露于中等折射率的微小变化时，由于有效折射率的大偏移，NW嵌入式腔体提供了最高的模式灵敏度。此外，提出的设计的器件灵敏度约为2300 nm / RIU，远高于标准领结配置的灵敏度。