An increasing amount of attention is being paid to guided-mode resonance (GMR) sensors since they can effectively detect small refractive indices (RIs) changes due to their narrow spectral linewidth and high efficiency. In this work, a binary, all-dielectric, asymmetric GMR (A-GMR) sensor structure with enhanced sensitivity and narrowed resonant linewidth is proposed to substantially improve the figure of merit (FOM) with respect to symmetric counterparts. To achieve the best performance, particle swarm optimization is employed to optimize the structural parameters. Furthermore, the proposed GMR sensor is compared with dielectric symmetric GMR sensors. High bulk sensitivity of 3157.6 nm/RIU, full width at half maximum down to 0.076 nm, and FOM of 41547.368 (RIU)−1 have been achieved for the A-GMR sensor, showing high-performance RI sensing.

中文翻译：

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高灵敏度、非对称结构的导模谐振传感器

导模谐振 (GMR) 传感器越来越受到人们的关注，因为它们具有窄光谱线宽和高效率，可以有效地检测微小的折射率 (RI) 变化。在这项工作中，提出了一种具有增强灵敏度和窄谐振线宽的二元、全电介质、非对称 GMR (A-GMR) 传感器结构，以大幅提高相对于对称传感器的品质因数 (FOM)。为了获得最佳性能，采用粒子群优化来优化结构参数。此外，还将所提出的 GMR 传感器与介电对称 GMR 传感器进行了比较。 A-GMR 传感器实现了 3157.6 nm/RIU 的高体灵敏度、低至 0.076 nm 的半峰全宽以及 41547.368 (RIU)−1 的 FOM，显示出高性能 RI 传感。