Plasmon‐Induced Optical Magnetism in an Ultrathin Metal Nanosphere‐Based Dimer‐on‐Film Nanocavity,Laser & Photonics Reviews

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Plasmon‐Induced Optical Magnetism in an Ultrathin Metal Nanosphere‐Based Dimer‐on‐Film Nanocavity
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-07-20 , DOI: 10.1002/lpor.202000068
Yongjun Meng _{1,

2} , Qiang Zhang _{3,

4,

5} , Dangyuan Lei ₆ , Yonglong Li ₇ , Siqi Li ₁ , Zhenzhen Liu ₅ , Wei Xie ₇ , Chi Wah Leung ₁

Affiliation

Recently, plasmon‐induced optical magnetism has attracted much research interest in nanophotonics and plasmonics due to intriguing applications in optical metamaterials, and ultrasensitive plasmonic nano‐metrology, among many others. Here, a strong in‐plane magnetic dipolar resonance in an ultrathin plasmonic nanocavity consisting of a silica‐coated gold nanosphere dimer coupled to a gold thin film is observed experimentally and explained theoretically. Multipolar expansion and numerical simulation disclose that such magnetic resonance is induced by a displacement current loop circulating around a nanometer thick triangular region in the cavity. The spectral response and radiation polarization of the magnetic mode are “visualized” by using a polarization‐resolved dark‐field imaging system at the single‐particle level. The resonance responses of this magnetic mode highly depends on cavity gap thickness, nanosphere dimension, and the incident angle, allowing straightforward resonance tuning from the visible to near‐infrared region and thus opening up a new avenue for magnetic resonance‐enhanced nonlinear optics and chiral optics.

中文翻译：

基于超薄金属纳米球的膜上二聚体纳米腔中的等离子诱导光磁。

近年来，由于在光学超材料中的有趣应用以及超灵敏的等离子体纳米计量学，等离激元诱导的光磁学引起了人们对纳米光子学和等离激元学的许多研究兴趣。在这里，通过实验观察并从理论上解释了超薄等离子体纳米腔中的强平面内磁偶极共振，该腔由二氧化硅涂层的金纳米球二聚体与金薄膜组成。多极膨胀和数值模拟表明，这种共振是由位移电流环引起的，该电流环在空腔中纳米厚的三角形区域周围循环。通过在单粒子级使用偏振分辨暗场成像系统，可以“可视化”磁模式的光谱响应和辐射偏振。

更新日期：2020-09-10

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