<p>This article exhibits a Kretschmann configuration-based plasmonic sensor, which has the access of label-free detection and real-time. To analyze the sensor’s performance for the detection of methane gas at a wavelength of 633 nm, the transfer matrix method is exploited with the help of the angular interrogation procedure. The proposed sensor leverages surface plasmon excitation via a silver layer. Additionally, a novel dielectric material, arsenic trisulfide, is introduced for the first time in the sensor to enhance sensor’s performance as well as to acts protection for the Ag’s oxidization. Initially, the thickness optimization for the considered layers is shown by analyzing the better minimum reflectance and sensitivity. Subsequently, the impact of the proposed sensor by comparing its performance with other structures, which are designed with the considered layers. With optimal structure, the sensor’s performances are analyzed for the detection of methane gas for different TMDC heterostructures and found that the maximum attained parameters are a sensitivity of 259.69 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">$^\circ /RIU$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mmultiscripts> <mrow /> <mrow /> <mo>∘</mo> </mmultiscripts> <mo stretchy="false">/</mo> <mi>R</mi> <mi>I</mi> <mi>U</mi> </mrow> </math></EquationSource> </InlineEquation>, a QF of 78.67 <InlineEquation ID="IEq2"> <EquationSource Format="TEX">${RIU}^{-1}$</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mi mathvariant="italic">RIU</mi> </mrow> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </msup> </math></EquationSource> </InlineEquation>, and a DA of 4.56. These results show a significant improvement with the existing work for the detection of methane gas. Finally, the electric field intensity for the sensor is shown, following by the standard fabrication steps at the end. Therefore, the proposed sensor can be used as high-performance carrier for the methane gas detection as well as used in several biosensing techniques.</p>

Plasmonic Methane Sensor Based on Arsenic Trisulfide—TMDC Thin Film Heterostructure

期刊论文
发表日期：

2025年8月15日

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Yesudasu Vasimalla,
Kalagara Manasa,
Norah A. M. Alsaif,
Sana Ben Khalifa,
Saleh Chebaane

摘要

This article exhibits a Kretschmann configuration-based plasmonic sensor, which has the access of label-free detection and real-time. To analyze the sensor’s performance for the detection of methane gas at a wavelength of 633 nm, the transfer matrix method is exploited with the help of the angular interrogation procedure. The proposed sensor leverages surface plasmon excitation via a silver layer. Additionally, a novel dielectric material, arsenic trisulfide, is introduced for the first time in the sensor to enhance sensor’s performance as well as to acts protection for the Ag’s oxidization. Initially, the thickness optimization for the considered layers is shown by analyzing the better minimum reflectance and sensitivity. Subsequently, the impact of the proposed sensor by comparing its performance with other structures, which are designed with the considered layers. With optimal structure, the sensor’s performances are analyzed for the detection of methane gas for different TMDC heterostructures and found that the maximum attained parameters are a sensitivity of 259.69 $^\circ /RIU$ $^{\circ} / R I U$ , a QF of 78.67 ${RIU}^{-1}$ ${RIU}^{- 1}$ , and a DA of 4.56. These results show a significant improvement with the existing work for the detection of methane gas. Finally, the electric field intensity for the sensor is shown, following by the standard fabrication steps at the end. Therefore, the proposed sensor can be used as high-performance carrier for the methane gas detection as well as used in several biosensing techniques.