Plasmonic coupling of gold nanosheet dimers for sensitive response of the environment

IF 2.3 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Physics Letters A Pub Date : 2025-04-11 DOI:10.1016/j.physleta.2025.130537

Ziyun Wang , Mengwei Ma , Kaifeng Deng, Yifan Zheng, Jinshen Lan, Ziyan Wang, Xuanli Zheng, Shengli Huang, Shuping Li, Junyong Kang

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Abstract

Plasmonic coupling of the nanoparticles plays a key role in the performance, but most previous studies have focused on the isolated nanoparticles, nanoparticle dimers with round surface or nanoparticle arrays. Here plasmonic properties of gold nanosheet monomers and dimers in rectangular structure are investigated. The plasmon resonance of the monomers is found to be primarily controlled by the light polarization, rather than the incident orientation. The strongest resonance is achieved when the polarization aligns with the long axis of the nanosheet. For the dimers, the strong coupling leads to the appearance of multistage plasmonic peaks and significant amplification of the resonant bands. Structural changes in the dimers induce the band shift and intensity variation. The optimal dimer displays a strong plasmonic coupling with a maximum electric field enhancement and a tremendous sensitivity of 748.3 nm/RIU, which provides valuable insights for the design and applications of noble metal nanostructures.

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等离子体耦合的金纳米片二聚体对环境的敏感响应

等离子体耦合对纳米颗粒的性能起着关键作用，但以往的研究大多集中在分离的纳米颗粒、圆形表面的纳米颗粒二聚体或纳米颗粒阵列上。本文研究了矩形结构的金纳米片单体和二聚体的等离子体性质。发现单体的等离子体共振主要受光偏振控制，而不是受入射方向控制。当极化与纳米片的长轴对齐时，共振达到最强。对于二聚体，强耦合导致多级等离子体峰的出现和共振带的显著放大。二聚体的结构变化引起了带移和强度变化。该二聚体具有较强的等离子体耦合，电场增强最大，灵敏度高达748.3 nm/RIU，为贵金属纳米结构的设计和应用提供了有价值的见解。

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

Physics Letters A 物理-物理：综合

CiteScore

5.10

自引率

3.80%

发文量

493

审稿时长

30 days

期刊介绍： Physics Letters A offers an exciting publication outlet for novel and frontier physics. It encourages the submission of new research on: condensed matter physics, theoretical physics, nonlinear science, statistical physics, mathematical and computational physics, general and cross-disciplinary physics (including foundations), atomic, molecular and cluster physics, plasma and fluid physics, optical physics, biological physics and nanoscience. No articles on High Energy and Nuclear Physics are published in Physics Letters A. The journal''s high standard and wide dissemination ensures a broad readership amongst the physics community. Rapid publication times and flexible length restrictions give Physics Letters A the edge over other journals in the field.