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Spin-controlled directional launching of surface plasmons at the subwavelength scale |
Tao Huang(黄韬)1, Jia-jian Wang(王佳见)2, Zi-wei Li(李梓维)2, Wei Liu(刘伟)1, Feng Lin(林峰)1, Zhe-yu Fang(方哲宇)1,3, Xing Zhu(朱星)1,4 |
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, Beijing 100871, China;
4 National Center for Nanoscience and Technology, Beijing 100190, China |
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Abstract 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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Received: 03 May 2016
Revised: 18 May 2016
Accepted manuscript online:
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PACS:
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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78.68.+m
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(Optical properties of surfaces)
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78.20.Bh
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(Theory, models, and numerical simulation)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61176120, 61378059, 60977015, 61422501, and 11374023), the National Basic Research Program of China (Grant Nos. 2012CB933004 and 2015CB932403), and Beijing Natural Science Foundation (Grant No. L140007). |
Corresponding Authors:
Xing Zhu
E-mail: zhuxing@pku.edu.cn
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Cite this article:
Tao Huang(黄韬), Jia-jian Wang(王佳见), Zi-wei Li(李梓维), Wei Liu(刘伟), Feng Lin(林峰), Zhe-yu Fang(方哲宇), Xing Zhu(朱星) Spin-controlled directional launching of surface plasmons at the subwavelength scale 2016 Chin. Phys. B 25 087302
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