Plasmonic CH4 Sensor Based on MIM Waveguide Coupled to Circular Nanorod in a Square-Shaped Cavity

IF 2.3 4区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Iet Optoelectronics Pub Date : 2025-03-18 DOI:10.1049/ote2.70002

Mohammad Ghanavati, Mohammad Azim Karami

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Abstract

A novel refractive index (RI) plasmonic sensor is designed and simulated, which is expected to make a significant advancement in gas sensing. The sensor is composed of silver, air-filled waveguide and a square shaped cavity. In the implemented cavity, 16 silver circular nanorods (CNs) are locally placed to enhance the sensing performance. Moreover, the cavity is filled with ultraviolet-curable fluoro-siloxane (UVCFS) in order to faithfully characterise methane gas concentrations. RI sensitivity (RIS) for Peak I is 1210.12 ± 4.62 nm/RIU and for Peak II is 969.64 ± 8.56 nm/RIU as well as figure of merit (FoM) of 20.00 ± 0.08 1/RIU at Peak I and 11.82 ± 0.10 1/RIU at Peak II, respectively. Furthermore, a significant methane gas sensitivity (S_Gas) is achieved: about 4 nm/% for Peak I and about 3 nm/% for Peak II which shows that it can well determine methane gas concentrations. The introduced plasmonic-based sensor brings potential applications in gas sensing due to its high sensitivity as well accuracy in detecting methane gas concentrations.

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基于MIM波导耦合方形腔内圆纳米棒的等离子体CH4传感器

设计并模拟了一种新型的折射率等离子体传感器，有望在气体传感领域取得重大进展。该传感器由银质充气波导和方形腔体组成。在实现的腔中，局部放置16个银圆形纳米棒（CNs）以增强传感性能。此外，空腔内填充了可紫外光固化的氟硅氧烷（UVCFS），以便忠实地表征甲烷气体浓度。峰I的RI灵敏度（RIS）为1210.12±4.62 nm/RIU，峰II的RI灵敏度（RIS）为969.64±8.56 nm/RIU，峰I和峰II的品质值（FoM）分别为20.00±0.08 1/RIU和11.82±0.10 1/RIU。此外，还获得了显著的甲烷气体灵敏度（SGas）：峰I约为4 nm/%，峰II约为3 nm/%，这表明它可以很好地确定甲烷气体浓度。由于等离子体传感器在检测甲烷气体浓度方面具有较高的灵敏度和准确性，因此在气体传感领域具有潜在的应用前景。

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来源期刊

Iet Optoelectronics 工程技术-电信学

CiteScore

4.50

自引率

0.00%

发文量

审稿时长

6 months

期刊介绍： IET Optoelectronics publishes state of the art research papers in the field of optoelectronics and photonics. The topics that are covered by the journal include optical and optoelectronic materials, nanophotonics, metamaterials and photonic crystals, light sources (e.g. LEDs, lasers and devices for lighting), optical modulation and multiplexing, optical fibres, cables and connectors, optical amplifiers, photodetectors and optical receivers, photonic integrated circuits, photonic systems, optical signal processing and holography and displays. Most of the papers published describe original research from universities and industrial and government laboratories. However correspondence suggesting review papers and tutorials is welcomed, as are suggestions for special issues. IET Optoelectronics covers but is not limited to the following topics: Optical and optoelectronic materials Light sources, including LEDs, lasers and devices for lighting Optical modulation and multiplexing Optical fibres, cables and connectors Optical amplifiers Photodetectors and optical receivers Photonic integrated circuits Nanophotonics and photonic crystals Optical signal processing Holography Displays