Optical chirality induced by spin-orbit interaction of light in a tightly focused Laguerre-Gaussian beam

doi:10.1088/1674-1056/acefc9

中国物理B ›› 2023, Vol. 32 ›› Issue (11): 114202-114202.doi: 10.1088/1674-1056/acefc9

Optical chirality induced by spin-orbit interaction of light in a tightly focused Laguerre-Gaussian beam

Mingchao Zhu(朱明超)¹, Shenggui Fu(付圣贵)¹, and Zhongsheng Man(满忠胜)^1,2,†

1 School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, China;
2 Collaborative Innovation Center of Light Manipulations and Application, Shandong Normal University, Jinan 250358, China

收稿日期:2023-06-21 修回日期:2023-07-31 接受日期:2023-08-14 出版日期:2023-10-16 发布日期:2023-10-24
通讯作者: Zhongsheng Man E-mail:zsman@sdut.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 12074224) and the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2021YQ02 and ZR2020MA087).

Optical chirality induced by spin-orbit interaction of light in a tightly focused Laguerre-Gaussian beam

Mingchao Zhu(朱明超)¹, Shenggui Fu(付圣贵)¹, and Zhongsheng Man(满忠胜)^1,2,†

1 School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, China;
2 Collaborative Innovation Center of Light Manipulations and Application, Shandong Normal University, Jinan 250358, China

Received:2023-06-21 Revised:2023-07-31 Accepted:2023-08-14 Online:2023-10-16 Published:2023-10-24
Contact: Zhongsheng Man E-mail:zsman@sdut.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 12074224) and the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2021YQ02 and ZR2020MA087).

摘要/Abstract

摘要： Optical chirality is one of the important and fundamental dynamic properties of light besides energy, momentum, and angular momentum. The quantification of electromagnetic chirality has been conceptualized only recently. Now, it is well known that for paraxial plane waves of light, the optical chirality is proportional to the ellipticity of the polarization ellipse, i.e., completely independent of the phase distribution. Here it is shown that optical vortex and state of polarization of the source paraxial field both have contributions to the optical chirality of the nonparaxial field generated by tightly focused Laguerre-Gaussian (LG) beam, which is in Stark contrast to the paraxial plane wave of light known from classical optics. The physical reason is the redistribution of local electromagnetic polarization in three dimensions associated with spin-orbit interaction.

关键词: tight focusing, optical chirality, spin-orbit interaction

Abstract: Optical chirality is one of the important and fundamental dynamic properties of light besides energy, momentum, and angular momentum. The quantification of electromagnetic chirality has been conceptualized only recently. Now, it is well known that for paraxial plane waves of light, the optical chirality is proportional to the ellipticity of the polarization ellipse, i.e., completely independent of the phase distribution. Here it is shown that optical vortex and state of polarization of the source paraxial field both have contributions to the optical chirality of the nonparaxial field generated by tightly focused Laguerre-Gaussian (LG) beam, which is in Stark contrast to the paraxial plane wave of light known from classical optics. The physical reason is the redistribution of local electromagnetic polarization in three dimensions associated with spin-orbit interaction.

Key words: tight focusing, optical chirality, spin-orbit interaction

中图分类号: (Diffraction and scattering)

42.25.Fx

11.30.Rd (Chiral symmetries) 67.30.hj (Spin dynamics) 71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)

Mingchao Zhu(朱明超), Shenggui Fu(付圣贵), and Zhongsheng Man(满忠胜). Optical chirality induced by spin-orbit interaction of light in a tightly focused Laguerre-Gaussian beam[J]. 中国物理B, 2023, 32(11): 114202-114202.

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Optical chirality induced by spin-orbit interaction of light in a tightly focused Laguerre-Gaussian beam

Optical chirality induced by spin-orbit interaction of light in a tightly focused Laguerre-Gaussian beam

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