Multiple Independently Controllable Fano Resonances Based on the MIM Waveguide and Their Application in Sensing

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

Plasmonics Pub Date : 2023-05-30 DOI:10.1007/s11468-023-01883-0

Yiping Sun, Desheng Qu, Qiaohua Wu, Chunlei Li

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Abstract

A multi-purpose waveguide structure utilizing surface plasma polariton (SPPs) has been developed. This structure consists of a metal–insulator-metal (MIM) straight waveguide with a silver baffle, an analogous M-shaped cavity, and a semi-ellipse cavity. Utilizing the finite element method, the structure’s optical transmission properties and magnetic field distributions are examined. The results show that Fano peaks maybe originate from different resonance cavities. Fano resonances can be adjusted individually by modifying the geometrical properties of the corresponding cavity. The refractive index sensing technique is investigated, and it is discovered that the refractive index sensitivity may reach up to 1980 nm/RIU. This proposed structure can detect cholesterol and ethylene glycol concentrations simultaneously by separating the analogous M-shaped cavity and the semi-ellipse cavity, with sensitivities reaching 30.2 nm mL/mg and 137.5 nm/%, respectively. Thus, it has the potential to be employed as a multifunctional nanoscale sensor.

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基于MIM波导的多个独立可控Fano谐振及其在传感中的应用

已经开发了一种利用表面等离子体极化激元（SPP）的多用途波导结构。该结构由带银挡板的金属-绝缘体-金属（MIM）直波导、类似的M形腔和半椭圆形腔组成。利用有限元方法，对该结构的光传输特性和磁场分布进行了研究。结果表明，Fano峰可能来源于不同的谐振腔。Fano谐振可以通过修改相应空腔的几何特性来单独调整。研究了折射率传感技术，发现折射率灵敏度可达1980nm/RIU。该结构可以通过分离类似的M形腔和半椭圆形腔同时检测胆固醇和乙二醇的浓度，灵敏度分别达到30.2 nm/mg和137.5 nm/%。因此，它具有用作多功能纳米级传感器的潜力。

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.