Design of an SPR-PCF Sensor Based on Au/Al2O3 Hyperbolic Metamaterial Structure

IF 5.6 4区物理与天体物理 Q2 CHEMISTRY, PHYSICAL

Plasmonics Pub Date : 2026-08-15 DOI:10.1007/s11468-026-03428-7

Xu Gao, Licui Ji, Honggang Pan, Qingcheng You, Yukun Zhu, Xing Wang, Xinjie Zhao, Yating Tang

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Abstract

This study presents a D-shaped photonic crystal fiber (PCF) surface plasmon resonance (SPR) sensor based on an Au/Al₂O₃ hyperbolic metamaterial (HMM) stack. By depositing a three-period Au/ Al₂O₃ HMM stack, consisting of six alternating layers, on the polished PCF surface, strong localized field enhancement is achieved through hyperbolic dispersion characteristics. Key structural parameters (Λ = 2.25 μm, d = 1.0 μm, f = 9.7 μm, t₁ = 4.5 nm, t₂ = 10.0 nm) are optimized via COMSOL simulations. The sensor exhibits a broad refractive-index (RI) detection range of 1.20–1.42 RIU, achieving a maximum wavelength sensitivity (WS) of 53,600 nm/RIU and a figure of merit (FOM) of 420.39 RIU^− 1. Compared with conventional Au-film structures, the HMM integration provides a clear enhancement in RI sensitivity, especially in the high-RI region. A feasible fabrication route, including fiber drawing, side polishing, and sequential deposition of the Au/Al₂O₃ multilayer, is also discussed. This work provides a numerically promising design for wide-range bulk RI sensing.

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基于Au/Al2O3双曲超材料结构的SPR-PCF传感器设计

本研究提出了一种基于Au/Al2O3双曲超材料（HMM）堆叠的d形光子晶体光纤（PCF）表面等离子体共振（SPR）传感器。通过在抛光后的PCF表面沉积由6层交替组成的三周期Au/ Al2O3 HMM堆栈，通过双曲色散特性实现了强局部场增强。通过COMSOL仿真优化了关键结构参数（Λ = 2.25 μm, d = 1.0 μm, f = 9.7 μm, t1 = 4.5 nm, t2 = 10.0 nm）。该传感器具有1.20-1.42 RIU的宽折射率（RI）检测范围，最大波长灵敏度（WS）为53,600 nm/RIU，优点系数（FOM）为420.39 RIU−1。与传统的au膜结构相比，HMM集成提供了明显的RI灵敏度增强，特别是在高RI区域。讨论了一种可行的制备路线，包括纤维拉伸、侧面抛光和Au/Al₂O₃多层膜的顺序沉积。这项工作为大范围体RI感测提供了一种数值上有前景的设计。

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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.