| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Theoretical research on the transverse spin of structured optical fields inside a waveguide |
| Zhiyong Wang(王智勇)1,†, Xiangru Wang(汪相如)1, Anran Li(李岸然)2, Kaiqiang Zhang(张开强)2, Yukun Ji(纪玉坤)2, and Mingyu Zhong(钟明玉)2 |
1 School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China;
2 Jining Keli Photoelectric Industrial Co. LTD, Jining 272000, China |
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Abstract Structured optical fields inside a waveguide possess the transverse spin, i.e., the spin angular momentum perpendicular to the direction of the waveguide. The physical origin of the transverse spin can be attributed to the presence of an effective rest mass of photons in guided waves, or equivalently, to the existence of a longitudinal field component, such that the transverse and longitudinal fields together form an elliptical polarization plane. In contrary to the traditional viewpoint, the transverse spin of photons in guided waves is also quantized, and its quantization form is related to the ellipticity of the polarization ellipse. The direction of the transverse spin depends on the propagation direction of electromagnetic waves along the waveguide, such a spin-momentum locking may have important applications in spin-dependent unidirectional optical interfaces. By means of a coupling between the transverse spin of guided waves and some physical degrees of freedom, one can develop an optical analogy of spintronics, i.e., spinoptics.
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Received: 24 October 2022
Revised: 19 February 2023
Accepted manuscript online: 27 February 2023
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PACS:
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42.82.Et
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(Waveguides, couplers, and arrays)
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42.50.Tx
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(Optical angular momentum and its quantum aspects)
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42.25.Ja
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(Polarization)
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42.25.Bs
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(Wave propagation, transmission and absorption)
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| Fund: Project supported by the 2021 Innovation capability enhancement project of small and medium-sized technologybased enterprises in Shandong Province of China (Grant No. 2021TSGC1043). We would like to thank Professor F. Nori for his helpful suggestions. |
Corresponding Authors:
Zhiyong Wang
E-mail: zywang@uestc.edu.cn
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Cite this article:
Zhiyong Wang(王智勇), Xiangru Wang(汪相如), Anran Li(李岸然), Kaiqiang Zhang(张开强), Yukun Ji(纪玉坤), and Mingyu Zhong(钟明玉) Theoretical research on the transverse spin of structured optical fields inside a waveguide 2023 Chin. Phys. B 32 064207
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