In this paper, a waveguide coupled with two intersected cavity ring resonators, based plasmonic sensor has been proposed, which is compact in design with higher sensitivity. The structural parameters of the sensor has a key role in its sensitivity and transmission spectrum, and are analyzed using the finite-difference time-domain method embedded in the commercial simulator Rsoft. The results yield a linearity between the refractive index of the material under testing and its resonance wavelengths. The maximum achieved linear sensitivity was S = 2448 nm/RIU for the second mode and S = 1120 nm/RIU for the first mode, its corresponding sensing resolution is $$4.08 \times {{10}^{-6}}$$ 4.08 × 10 - 6 RIU for mode 2 and $$8.98 \times {{10}^{-6}}$$ 8.98 × 10 - 6 RIU for mode 1, which makes our design a promising candidate for high performance nano-sensors and bio-sensing devices. It’s also applicable as a band-stop filter, due to the fact that the positions of transmission peaks and bandwidth can be easily manipulated, by adjusting both the inner radius and the distance between the centers of the two ring resonators.

中文翻译：

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基于金属-绝缘体-金属结构的交叉双环谐振器的高灵敏度传感器和带阻滤波器

在本文中，提出了一种基于等离子体传感器与两个相交腔环谐振器耦合的波导，该传感器设计紧凑，灵敏度更高。传感器的结构参数对其灵敏度和透射光谱起关键作用，并使用嵌入在商业模拟器 Rsoft 中的有限差分时域方法进行分析。结果产生了被测材料的折射率与其共振波长之间的线性关系。获得的最大线性灵敏度对于第二模式为 S = 2448 nm/RIU，对于第一模式为 S = 1120 nm/RIU，其相应的传感分辨率为 $$4.08 \times {{10}^{-6}}$$$4.08 × 10 - 6 RIU 模式 2 和 $$8.98 \times {{10}^{-6}}$$ 8.98 × 10 - 6 RIU 模式 1，这使我们的设计成为高性能纳米传感器和生物传感设备的有希望的候选者。它也可用作带阻滤波器，因为通过调整两个环形谐振器的内半径和中心之间的距离，可以轻松操纵传输峰值和带宽的位置。