Spin-controlled directional launching of surface plasmons at the subwavelength scale

In this paper, we demonstrate a spin-controlled directional launching of surface plasmons at the subwavelength scale.Based on the principle of optical spin＇s effect for the geometric phase of light, the nanostructures were designed. The inclination of the structures decides the spin-related geometri...

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Published inChinese physics B Vol. 25; no. 8; pp. 331 - 334
Main Author 黄韬 王佳见 李梓维 刘伟 林峰 方哲宇 朱星
Format Journal Article
LanguageEnglish
Published 01.08.2016
Subjects
Inclination
Launchers
Launching
Mathematical models
Photons
Plasmons
Polaritons
Simulation
亚波长
几何相位
定向发射
扫描近场光学显微镜
纳米结构
自旋效应
表面等离子体激元
表面等离子激元
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ISSN1674-1056
2058-3834
1741-4199
DOI10.1088/1674-1056/25/8/087302

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Summary:In this paper, we demonstrate a spin-controlled directional launching of surface plasmons at the subwavelength scale.Based on the principle of optical spin＇s effect for the geometric phase of light, the nanostructures were designed. The inclination of the structures decides the spin-related geometric phase and their relative positions decide the distance-related phase. Hence, the propagation direction of the generated surface plasmon polaritons（SPPs） can be controlled by the spin of photons. Numerical simulations by the finite difference time domain（FDTD） method have verified our theoretical prediction. Our structure is fabricated on the Au film by using a focused ion beam etching technique. The total size of the surface plasmon polariton（SPP） launcher is 320 nm by 180 nm. The observation of the SPP launching by using scanning near-field optical microscopy is in agreement with our theory and simulations. This result may provide a new way of spin-controlled directional launching of SPP.
Bibliography:surface plasmon, spin-controlled, directional launching, subwavelength scale
Tao Huang, Jia-jian Wang, Zi-wei Li, Wei Liu, Feng Lin, Zhe-yu Fang, and Xing Zhu（1 State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China; 2 Center for Nanoscale Science and Technology, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China;3 Collaborative Innovation Center of Quantum Matter, Beifing 100871, China; 4National Center for Nanoscience and Technology, Beijing 100190, China）
11-5639/O4
In this paper, we demonstrate a spin-controlled directional launching of surface plasmons at the subwavelength scale.Based on the principle of optical spin＇s effect for the geometric phase of light, the nanostructures were designed. The inclination of the structures decides the spin-related geometric phase and their relative positions decide the distance-related phase. Hence, the propagation direction of the generated surface plasmon polaritons（SPPs） can be controlled by the spin of photons. Numerical simulations by the finite difference time domain（FDTD） method have verified our theoretical prediction. Our structure is fabricated on the Au film by using a focused ion beam etching technique. The total size of the surface plasmon polariton（SPP） launcher is 320 nm by 180 nm. The observation of the SPP launching by using scanning near-field optical microscopy is in agreement with our theory and simulations. This result may provide a new way of spin-controlled directional launching of SPP.
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ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/25/8/087302