| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Modulation and enhancement of photonic spin Hall effect with graphene in broadband regions |
| Peng Dong(董鹏)1,2,3, Gaojun Wang(王高俊)1, and Jie Cheng(程杰)2,† |
| 1 College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China; 2 School of Science, New Energy Technology Engineering Laboratory of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing 210023, China; 3 Key Laboratory of Radio Frequency and Micro-Nano Electronics of Jiangsu Province, Nanjing 210023, China |
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Abstract The photonic spin Hall effect (SHE) holds great potential applications in manipulating spin-polarized photons. However, the SHE is generally very weak, and previous studies of amplifying photonic SHE were limited to the incident light in a specific wavelength range. In this paper, we propose a four-layered nanostructure of prism-graphene-air-substrate, and the enhanced photonic SHE of reflected light in broadband range of 0 THz-500 THz is investigated theoretically. The spin shift can be dynamically modulated by adjusting the thickness of air gap, Fermi energy of graphene, and also the incident angle. By optimizing the structural parameter of this structure, the giant spin shift (almost equal to its upper limit, half of the incident beam waist) in broadband range is achieved, covering the terahertz, infrared, and visible range. The difference is that in the terahertz region, the Brewster angle corresponding to the giant spin shift is larger than that of infrared range and visible range. These findings provide us with a convenient and effective way to tune the photonic SHE, and may offer an opportunity for developing new tunable photonic devices in broadband range.
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Received: 08 October 2020
Revised: 07 November 2020
Accepted manuscript online: 23 November 2020
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PACS:
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42.25.-p
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(Wave optics)
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41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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42.79.-e
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(Optical elements, devices, and systems)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11405089), the General Program of the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20171440), the Postgraduate Research & Practice Innovation Program of Jiangsu Province, China (Grant No. SJKY19\textunderscore 0779), and the Natural Science Foundation of Nanjing University of Posts and Telecommunications, China (Grant Nos. NY218039 and NY220030). |
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Corresponding Authors:
†Corresponding author. E-mail: chengj@njupt.edu.cn
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Cite this article:
Peng Dong(董鹏), Gaojun Wang(王高俊), and Jie Cheng(程杰) Modulation and enhancement of photonic spin Hall effect with graphene in broadband regions 2021 Chin. Phys. B 30 034202
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