Plasmonic refractive index nano sensor based on triplet coupled stub resonators based Fano resonances,IET Optoelectronics

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Plasmonic refractive index nano sensor based on triplet coupled stub resonators based Fano resonances
IET Optoelectronics ( IF 2.3 ) Pub Date : 2023-10-18 , DOI: 10.1049/ote2.12107
Babak Moeinimaleki ₁ , Hassan Kaatuzian ₁ , Abdolber Mallah Livani ₂ , Mohammadmahdi Modabberanbeh ₁

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Fano resonance arises from the superposition of a narrow discrete resonance with a continuous state. In this paper, a Fano resonance-based plasmonic refractive index sensor based on nanoscale metal-insulator-metal (MIM) waveguides is proposed and evaluated by applying the two-dimensional finite-difference time-domain (2D FDTD) method. An MIM-based single stub vertically attached to an MIM waveguide is considered as the unit cell of the waveguide system of the proposed structure. A transfer matrix of transmission and coupling complex coefficients is defined for the unit cell of the waveguide system of the proposed sensor, and the conditions for the authenticity of its modeling based on the transmission line theory are evaluated. A system of triplet coupled stub resonators (TCSRs) attached to an MIM waveguide is coupled with a disk resonator to induce Fano resonances in the transmission spectrum of the sensor. Fano resonance and its characteristics are utilized to improve the essential operating parameters of the sensor, such as full width at half maximum (FWHM) and figure of merit (FOM). In optimized conditions, for the system of TCSRs coupled to a disk resonator, a resonance with a sensitivity of 684 nm/RIU and an FOM of 621.8 1/RIU exhibited. Also, for the system of TCSRs coupled to a ring resonator, a resonance with a sensitivity of 3524 nm/RIU and an FOM of 35.24 1/RIU was achieved. Eventually, the numerically achieved results for the operating parameters of the sensor are validated using governing analytical methods.

中文翻译：

基于法诺共振的三线态耦合短截线谐振器的等离子体折射率纳米传感器

法诺共振是由窄离散共振与连续状态的叠加产生的。本文提出了一种基于纳米级金属-绝缘体-金属（MIM）波导的法诺共振等离子体折射率传感器，并通过应用二维时域有限差分（2D FDTD）方法进行了评估。垂直连接到 MIM 波导的基于 MIM 的单短截线被视为所提出结构的波导系统的单元。为所提出的传感器波导系统的晶胞定义了传输和耦合复数系数的传输矩阵，并评估了基于传输线理论的建模真实性的条件。连接到 MIM 波导的三重态耦合短截线谐振器 (TCSR) 系统与盘式谐振器耦合，以在传感器的传输光谱中引发 Fano 谐振。利用法诺共振及其特性来改善传感器的基本工作参数，例如半峰全宽 (FWHM) 和品质因数 (FOM)。在优化条件下，对于与盘式谐振器耦合的 TCSR 系统，表现出灵敏度为 684 nm/RIU 和 FOM 为 621.8 1/RIU 的谐振。此外，对于与环形谐振器耦合的 TCSR 系统，实现了灵敏度为 3524 nm/RIU 和 FOM 为 35.24 1/RIU 的谐振。最终，使用控制分析方法验证传感器操作参数的数值结果。

更新日期：2023-10-18

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