中国物理B ›› 2023, Vol. 32 ›› Issue (12): 124212-124212.doi: 10.1088/1674-1056/ad0ccc

• • 上一篇    下一篇

Spin splitting of vortex beams on the surface of natural biaxial hyperbolic materials

Hong Liang(梁红)1, Haoyuan Song(宋浩元)2, Yubo Li(李宇博)2, Di Yu(于迪)2, and Shufang Fu(付淑芳)2,†   

  1. 1 Department of Physics, Harbin University, Harbin 150086, China;
    2 Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, China
  • 收稿日期:2023-09-22 修回日期:2023-11-05 接受日期:2023-11-16 出版日期:2023-11-14 发布日期:2023-12-14
  • 通讯作者: Shufang Fu E-mail:shufangfu75@163.com
  • 基金资助:
    Project supported by the Natural Science Foundation of Heilongjiang Province of China (Grant No.LH2022F041).

Spin splitting of vortex beams on the surface of natural biaxial hyperbolic materials

Hong Liang(梁红)1, Haoyuan Song(宋浩元)2, Yubo Li(李宇博)2, Di Yu(于迪)2, and Shufang Fu(付淑芳)2,†   

  1. 1 Department of Physics, Harbin University, Harbin 150086, China;
    2 Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, China
  • Received:2023-09-22 Revised:2023-11-05 Accepted:2023-11-16 Online:2023-11-14 Published:2023-12-14
  • Contact: Shufang Fu E-mail:shufangfu75@163.com
  • Supported by:
    Project supported by the Natural Science Foundation of Heilongjiang Province of China (Grant No.LH2022F041).

摘要: We investigated the spin splitting of vortex beam on the surface of biaxial natural hyperbolic materials (NHMs) rotated by an angle with respect to the incident plane. An obvious asymmetry of spatial shifts produced by the left-handed circularly (LCP) component and right-handed circularly polarized (RCP) component is exhibited. We derived the analytical expression for in- and out-of-plane spatial shifts for each spin component of the vortex beam. The orientation angle of the optical axis plays a key role in the spin splitting between the two spin components, which can be reflected in the simple expressions for spatial shifts without the rotation angle. Based on an α-MoO3 biaxial NHM, the spatial shifts of the two spin components with the topological charge were investigated. As the topological charge increases, the spatial shifts also increase; in addition, a tiny spatial shift close to zero can be obtained if we control the incident frequency or the polarization of the reflected beams. It can also be concluded that the maximum of the spin splitting results from the LCP component at p-incidence and the RCP component at s-incidence in the RB-II hyperbolic frequency band. The effect of the incident angle and the thickness of the α-MoO3 film on spin splitting is also considered. These results can be used for manipulating infrared radiation and optical detection.

关键词: spin splitting, hyperbolic material, vortex beam, orbital angular momentum

Abstract: We investigated the spin splitting of vortex beam on the surface of biaxial natural hyperbolic materials (NHMs) rotated by an angle with respect to the incident plane. An obvious asymmetry of spatial shifts produced by the left-handed circularly (LCP) component and right-handed circularly polarized (RCP) component is exhibited. We derived the analytical expression for in- and out-of-plane spatial shifts for each spin component of the vortex beam. The orientation angle of the optical axis plays a key role in the spin splitting between the two spin components, which can be reflected in the simple expressions for spatial shifts without the rotation angle. Based on an α-MoO3 biaxial NHM, the spatial shifts of the two spin components with the topological charge were investigated. As the topological charge increases, the spatial shifts also increase; in addition, a tiny spatial shift close to zero can be obtained if we control the incident frequency or the polarization of the reflected beams. It can also be concluded that the maximum of the spin splitting results from the LCP component at p-incidence and the RCP component at s-incidence in the RB-II hyperbolic frequency band. The effect of the incident angle and the thickness of the α-MoO3 film on spin splitting is also considered. These results can be used for manipulating infrared radiation and optical detection.

Key words: spin splitting, hyperbolic material, vortex beam, orbital angular momentum

中图分类号:  (Edge and boundary effects; reflection and refraction)

  • 42.25.Gy
41.85.Ct (Particle beam shaping, beam splitting) 78.20.-e (Optical properties of bulk materials and thin films) 78.68.+m (Optical properties of surfaces)