劈裂纳米环多极表面等离激元共振及折射率传感特性分析

核聚变与等离子体物理 ›› 2015, Vol. 35 ›› Issue (1): 79-85.

劈裂纳米环多极表面等离激元共振及折射率传感特性分析

宁思同，高希宇，黄运欢，殷丽艳

(1. 太原理工大学物理与光电工程学院，太原 030024；2. 新型传感器与智能控制教育部重点实验室，太原 030024)

收稿日期:2014-02-12 修回日期:2014-09-14 出版日期:2015-03-15 发布日期:2015-03-13
作者简介:宁思同(1988-)，女，山东宁阳人，硕士，研究方向：表面等离激元光子学。

Analysis of multipolar localized surface plasmon resonances in metallic split-ring resonators and refractive index sensing performances

NING Si-tong, GAO Xi-yu, HUANG Yun-huan, YIN Li-yan

(1. College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024;
2. Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education, Taiyuan030024)

Received:2014-02-12 Revised:2014-09-14 Online:2015-03-15 Published:2015-03-13

摘要/Abstract

摘要：

研究了在三开口劈裂金属纳米环中，当入射场偏振方向不同时出现的多极局域表面等离激元共振现象及折射率传感特性。研究表明，当入射场偏振方向分别沿x 轴和y 轴时，在可见光-近红外区域分别激发起两个和三个明显的共振峰。通过改变缺口的张角，能够实现对共振峰位和强度的可控调整。共振峰位处劈裂纳米环的近场分布表明，LHA(左半弧)和DRHA(双右半弧)之间等离激元的杂化耦合是形成上述共振的原因。劈裂纳米环的多极共振非常适合折射率传感应用。当改变周围环境折射率，入射场沿x 轴偏振时，折射率敏感度的最大值可达到1365nm/RIU；入射场沿y 轴偏振时，折射率敏感度最大值可达2229nm/RIU。

关键词: 局域表面等离激元共振, 劈裂纳米环, 近场增强, 共振模式, 折射率传感

Abstract:

Metallic split-ring resonators with three gaps are studied in this paper. There are multipolar localized surface plasmon resonances in the spectra for different incident polarizations, and the refractive index sensing performances are also studied. It is shown that there are two and three prominent resonances in the visible light and near infrarad region when the incident polarization is along the x- and the y-axis, respectively. The resonance position and intensity can be well tuned by adjusting the angle between the gaps. Near field enhancement distributions of the split-ring resonators at the resonance peak reveal that plasmon hybridization between the the LHA (left half arc) and DRHA (double right arc) causes the multipolar resonances. The multipolar resonances are very suitable for refractive index sensing applications. It is shown that when the incident polarization is along x-axis, the maximum sensitivity of the refractive index is about 1365nm/RIU and when the polarization is along y-axis, the maximum sensitivity can be as large as 2229nm/RIU.

Key words: Localized surface plasmon resonances, Split-ring resonator, Near field enhancement, Resonant model, Refractive index sensing

中图分类号:

O539

宁思同，高希宇，黄运欢，殷丽艳. 劈裂纳米环多极表面等离激元共振及折射率传感特性分析[J]. 核聚变与等离子体物理, 2015, 35(1): 79-85.

NING Si-tong, GAO Xi-yu, HUANG Yun-huan, YIN Li-yan. Analysis of multipolar localized surface plasmon resonances in metallic split-ring resonators and refractive index sensing performances[J]. NUCLEAR FUSION AND PLASMA PHYSICS, 2015, 35(1): 79-85.

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