Plasmonic Sensor Based on S-Shaped Metal-Insulator-Metal Waveguide for the Detection of Water-Soluble Vitamins

IF 3.3 4区物理与天体物理 Q2 CHEMISTRY, PHYSICAL

Plasmonics Pub Date : 2024-08-27 DOI:10.1007/s11468-024-02506-y

Yiping Sun, Yongpeng Ren, Desheng Qu, Fumeng Qin, Chunlei Li

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Abstract

In this study, a compact plasmonic sensor that can generate dual Fano resonances is proposed. The structure is composed of a metal-insulator-metal (MIM) S-shaped waveguide with baffle, an analogous C-shaped resonator (ACR), and a T-shaped resonator with an annular cavity (TRAC). Employing the finite element method (FEM), the optical transmission characteristics of the structure are investigated. The results indicate that the dual Fano resonances arise from different resonators and can be independently tuned by altering the structural parameters of different resonators. Then, through adjusting the refractive index (RI) of the medium within the resonator in the range of 1.3–1.4, the RI sensing properties of the structure are also analyzed. The maximum RI sensitivity (S) and figure of merit (FOM) can be up to 2400 nm/RIU and 95.86 RIU⁻¹. Moreover, depending on the independence of the ACR and the TRAC, the sensor has efficient biochemical sensing characteristics and is used to achieve simultaneous determination of water-soluble vitamin B1 and vitamin C. The corresponding concentration sensitivities can be up to 500 nm·ml/g and 224 nm/C_vc, respectively. Consequently, the structure has significant potential for multifunctional biochemical sensing applications in high-density integrated circuits.

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用于检测水溶性维生素的基于 S 形金属-绝缘体-金属波导的等离子传感器

本研究提出了一种可产生双法诺共振的紧凑型等离子传感器。该结构由一个带挡板的金属-绝缘体-金属（MIM）S 形波导、一个类似的 C 形谐振器（ACR）和一个带环形腔的 T 形谐振器（TRAC）组成。采用有限元法（FEM）研究了该结构的光传输特性。结果表明，双法诺共振产生于不同的谐振器，并可通过改变不同谐振器的结构参数进行独立调谐。然后，通过在 1.3-1.4 范围内调节谐振器内介质的折射率（RI），还分析了该结构的 RI 传感特性。最大 RI 灵敏度 (S) 和优点系数 (FOM) 分别可达 2400 nm/RIU 和 95.86 RIU-1。此外，由于 ACR 和 TRAC 的独立性，该传感器还具有高效的生化传感特性，可用于同时测定水溶性维生素 B1 和维生素 C。因此，该结构在高密度集成电路的多功能生化传感应用中具有巨大潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Plasmonics 工程技术-材料科学：综合

CiteScore

5.90

自引率

6.70%

发文量

164

审稿时长

2.1 months

期刊介绍： Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons. Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.