Effect of thallium bromide and gold layer thickness on the optical performance of surface plasmon resonance sensors

IF 2.8 3区物理与天体物理 Q2 PHYSICS, CONDENSED MATTER

Physica B-condensed Matter Pub Date : 2025-09-12 DOI:10.1016/j.physb.2025.417803

Bhishma Karki , Youssef Trabelsi , Rajeev Kumar , Subbulakshmi Ganesan , Alok Kumar Mishra , T. Krithiga , Sanjeev Kumar

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Abstract

For high-sensitivity biosensing applications, this work offers a thorough examination of multilayer surface plasmon resonance (SPR) sensor structures based on different silver (Ag), thallium bromide (TIBr), gold (Au), and black phosphorus (BP) layer thicknesses to maximize optical performance. Resonance angle shift (Δθ_res), sensitivity (S), reflectance minimum (R_min), full width at half maximum (FWHM), detection accuracy (DA), and figure of merit (FoM) were among the important metrics used to assess the sensor. The structure that had 45 nm Ag and 1 nm TIBr with an Au (1 nm) layer showed the best balance between a high sensitivity (368.38 _°/RIU), low R_min (0.018), and remarkable FoM of 128.9/RIU. Without an Au layer, the maximum sensitivity of 372.19°/RIU and FoM of 104.21/RIU is obtained at 38 nm Ag thickness. Through carefully calibrated multilayer compositions, these findings offer important insights into the design of high-performance SPR sensors.

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溴化铊和金层厚度对表面等离子体共振传感器光学性能的影响

对于高灵敏度的生物传感应用，这项工作提供了基于不同银（Ag）、溴化铊（TIBr）、金（Au）和黑磷（BP）层厚度的多层表面等离子体共振（SPR）传感器结构的全面研究，以最大限度地提高光学性能。共振角移位（Δθres）、灵敏度(S)、最小反射率（Rmin）、半最大全宽度（FWHM）、检测精度（DA）和性能值（FoM）是用于评估传感器的重要指标。45 nm Ag + 1 nm TIBr + 1 nm Au层的结构在高灵敏度（368.38°/RIU）、低Rmin（0.018）和显著的FoM （128.9/RIU）之间取得了最好的平衡。在没有Au层的情况下，在38 nm Ag厚度下，灵敏度为372.19°/RIU， FoM为104.21°/RIU。通过仔细校准多层成分，这些发现为高性能SPR传感器的设计提供了重要的见解。

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

Physica B-condensed Matter 物理-物理：凝聚态物理

CiteScore

4.90

自引率

7.10%

发文量

703

审稿时长

44 days

期刊介绍： Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work. Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas: -Magnetism -Materials physics -Nanostructures and nanomaterials -Optics and optical materials -Quantum materials -Semiconductors -Strongly correlated systems -Superconductivity -Surfaces and interfaces