等离子体子
纳米光子学
材料科学
光学
光电子学
表面等离子体子
拉曼光谱
纳米光刻
极化(电化学)
物理
化学
医学
制作
病理
物理化学
替代医学
作者
Shaobo Li,Shuming Yang,Fei Wang,Qiang Liu,Biyao Cheng,Yossi Rosenwaks
出处
期刊:Nanophotonics
[De Gruyter]
日期:2021-11-16
卷期号:10 (16): 4113-4123
被引量:3
标识
DOI:10.1515/nanoph-2021-0405
摘要
Abstract Metallic plasmonic probes have been successfully applied in near-field imaging, nanolithography, and Raman enhanced spectroscopy because of their ability to squeeze light into nanoscale and provide significant electric field enhancement. Most of these probes rely on nanometric alignment of incident beam and resonant structures with limited spectral bandwidth. This paper proposes and experimentally demonstrates an asymmetric fiber tip for broadband interference nanofocusing within its full optical wavelengths (500–800 nm) at the nanotip with 10 nm apex. The asymmetric geometry consisting of two semicircular slits rotates plasmonic polarization and converts the linearly polarized plasmonic mode to the radially polarized plasmonic mode when the linearly polarized beam couples to the optical fiber. The three-dimensional plasmonic modulation induces circumference interference and nanofocus of surface plasmons, which is significantly different from the nanofocusing through plasmon propagation and plasmon evolution. The plasmonic interference modulation provides fundamental insights into the plasmon engineering and has important applications in plasmon nanophotonic technologies.
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