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Employment of cascaded coupled resonators for resolution enhancement in plasmonic refractive index sensors

机译：采用级联耦合谐振器提高等离激元折射率传感器的分辨率

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摘要

A very high resolution refractive index optical sensor is proposed in this paper. It is based on metal-insulator-metal plasmonic waveguides. The structure is numerically simulated using finite difference time domain method. The suggested plasmonic topology is conceived upon a waveguide which is laterally coupled with cascaded coupled concentric ring and disk resonators. It acts as a filter with a quality factor of 298.6. The sensor provides a sensitivity equal to 640.6 nm/RIU and a maximum figure of merit (FoM) of 287.9 RIU~(-1) which is the highest FoM reported for plasmonic refractive index sensors. It is observed that a±0.001 change in refractive index of the analyte for index the range of 1-1.13 can easily be detected by this sensor. The small required footprint, simple, modular topology and its good resolution are the benefits of the proposed structure.
机译：本文提出了一种高分辨率的光学传感器。它基于金属-绝缘体-金属等离激元波导。使用有限差分时域方法对结构进行了数值模拟。所建议的等离子体拓扑构想在波导上，该波导与级联耦合的同心环和盘式谐振器横向耦合。它充当质量因子为298.6的过滤器。该传感器的灵敏度等于640.6 nm / RIU，最大品质因数（FoM）为287.9 RIU〜（-1），是等离激元折射率传感器的最高FoM。观察到，通过该传感器可以容易地检测到在1-1.13范围内的被分析物的折射率的±0.001变化。所要求的结构的优点是所需的占地面积小，简单的模块化拓扑及其良好的分辨率。

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