Ultra-sharp plasmonic resonance in graphene-coated triangular arrays for high-precision sensing

IF 3.1 3区 物理与天体物理 Q2 Engineering
Optik Pub Date : 2025-08-25 DOI:10.1016/j.ijleo.2025.172511
Leila Mehraban, Mojtaba Sadeghi, Zahra Adelpour
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引用次数: 0

Abstract

A high-performance plasmonic sensor featuring a graphene-coated triangular array is presented that achieves an exceptional combination of spectral sharpness and sensitivity. The sensor design demonstrates an ultra-narrow full width half maximum (FWHM) of 0.52 nm, enabled by strong plasmonic field confinement from the triangular array’s sharp vertices, suppressing radiative losses and graphene’s unique damping of plasmon decay via its high charge-carrier mobility and conductivity. The finite element method (FEM) simulations yield a record Q-factor of 1211 and figure of merit (FOM) of 769 RIU⁻¹ while maintaining 400 nm/RIU sensitivity across a broad refractive index range (1.0–2.0). The optimized geometry (400 nm periodicity, 5 nm Au thickness) efficiently excites surface plasmons in the visible-NIR (400–800 nm). Graphene-enhanced charge-density oscillations, combined with the array’s field confinement, enable a resolution of 1.3 × 10⁻5 RIU (at SNR=100), establishing this platform for sub-nanometer spectral resolution in molecular sensing.
用于高精度传感的石墨烯涂层三角形阵列的超尖锐等离子体共振
提出了一种高性能等离子体传感器,具有石墨烯涂层三角形阵列,实现了光谱清晰度和灵敏度的卓越结合。该传感器设计展示了0.52 nm的超窄全宽半最大值(FWHM),这是由三角形阵列尖锐顶点的强等离子体场约束实现的,通过其高电荷载流子迁移率和导电性,抑制了辐射损失和石墨烯独特的等离子体衰变阻尼。在宽折射率范围(1.0-2.0)内保持400 nm/RIU灵敏度的同时,有限元法(FEM)模拟产生了1211的q因子和769 RIU的优点图(FOM)。优化后的几何结构(400 nm周期,5 nm Au厚度)在可见光-近红外(400 - 800 nm)有效激发表面等离子体激元。石墨烯增强的电荷密度振荡与阵列的场约束相结合,使分辨率达到1.3 × 10⁻5 RIU(信噪比=100),为亚纳米光谱分辨率的分子传感建立了平台。
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来源期刊
Optik
Optik 物理-光学
CiteScore
6.90
自引率
12.90%
发文量
1471
审稿时长
46 days
期刊介绍: Optik publishes articles on all subjects related to light and electron optics and offers a survey on the state of research and technical development within the following fields: Optics: -Optics design, geometrical and beam optics, wave optics- Optical and micro-optical components, diffractive optics, devices and systems- Photoelectric and optoelectronic devices- Optical properties of materials, nonlinear optics, wave propagation and transmission in homogeneous and inhomogeneous materials- Information optics, image formation and processing, holographic techniques, microscopes and spectrometer techniques, and image analysis- Optical testing and measuring techniques- Optical communication and computing- Physiological optics- As well as other related topics.
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