Spin Hall effect of light reflected from a magnetic thin film

Ren, Jianjun; Li, Yan; Lin, Yida; Qin, Yi; Wu, Rui; Yang, Jinbo; Xiao, Yun‐Feng; Yang, Hong; Gong, Qihuang

doi:10.1063/1.4764008

Cited by 37 publications

(6 citation statements)

References 21 publications

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“…首先, 分析磁光克尔效应产生的原因: 从宏观上看, 磁性材料被磁化后会导致其介电张量中出现不对称的非对角元素, 从而使其光学性质发生变化. 因此, 光和磁性材料之间的相互作用可以由下式带有磁光常数的介电张量来表示 [13,48] :…”

Section: 理论研究和方法unclassified

Giant and controllable in-plane spin angular shifts in bulk and ultrathin magnetic materials

Li¹,

Yuan²,

Yang³

et al. 2023

Acta Phys. Sin.

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The magneto-optical Kerr effect (MOKE) refers to the rotation of the polarization plane when a linearly polarized light is reflected at the surface of magnetic material. The MOKE reveals the magnetization of the optical properties of magnetic material and can be characterized by the dielectric tensor containing the magneto-optical constant. Thus, exploring the MOKE requires very precise determination of the magneto-optical constant. The photonic spin Hall effect (PSHE), which corresponds to the lateral and in-plane spin-dependent splitting of the beam, can be used as an effective method to characterize the magneto-optical constant due to its advantage of being extremely sensitive to changes in the physical parameters of the material. Most of the previous studies only considered the case of a single thickness of magnetic material and a single MOKE and need to introduce complex weak measurement techniques to observe the photonic spin Hall effect. In this work, we theoretically investigate the in-plane spin angular shifts in three MOKE cases in bulk and ultrathin magnetic materials. We can effectively tune the in-plane angular displacements of different magnetic material thickness by changing the magnetic field direction corresponding to different MOKEs and changing the magneto-optical constants (including amplitude and phase). The research results show that in the case of bulk and ultrathin magnetic materials, the internal spin angular displacements under different MOKEs will show different trends when the magneto-optical constants change the amplitude and phase, especially in ultra-thin magnetic material. In the lateral Kerr effect in thin material, the photon in-plane angular displacement does not affect the change of the magneto-optical constant, but in other cases, the amplitude relative to the phase has a much larger effect on the photon in-plane angular displacement. In this regard, we propose a new method which can directly determine the amplitude and phase of the magneto-optical constant by using the huge in-plane spin angular displacement without considering the weak measurements and can also judge different MOKEs according to the variation of the in-plane angular displacement in the bulk and ultrathin magnetic materials. This method not only provides a new probe for measuring magneto-optical constants but also expands the study of spin photonics.

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Section: 理论研究和方法unclassified

Giant and controllable in-plane spin angular shifts in bulk and ultrathin magnetic materials

Li¹,

Yuan²,

Yang³

et al. 2023

Acta Phys. Sin.

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“…Conventionally, the IF shift is defined as the transverse displacement of the gravity center of the entire reflected light beam, when a left circularly polarized (LCP) or a right circularly polarized (RCP) beam is incident; while SHEL is the transverse splitting of the LCP and RCP spin components when a linearly polarized light (LCP+RCP) is incident. Owing to the potential applications in quantum information and precision metrology, extensive studies on these beam shifts have been carried out both theoretically and experimentally in the past decades, using various materials [16][17][18][19][20][21][22] and different beam shapes [23][24][25]. For an incident linear polarization, no matter what the angle of polarization of the electric field is, the incident light can be always regarded as the superposition of an equal amount of LCP and RCP spin components.…”

Section: Introductionmentioning

confidence: 99%

Spin separations in the spin Hall effect of light

et al. 2015

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In the spin Hall effect of light (SHEL) with an incident linear polarization, the left circularly polarized (LCP) and the right circularly polarized (RCP) spin components are transversely shifted to opposite sides of the incident plane. We find that each spin component of the reflected or the refracted light is actually the coherent superposition of a pair with the same handedness. The two parts in a pair are generated by both the incident LCP and RCP components, respectively, and have different transverse shifts. Their weighted shifts lead to the overall displacement of the corresponding spin component. This perspective can successfully elucidate the dependence of the SHEL spin separations on the angle of polarization of the incident electric field.

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“…Generally, the spin-orbit interaction is typically related to two types of geometric phases: the propagation phase and the Pancharatnam-Berry (PB) phase, which are associated with the propagation direction and polarization state of light, respectively. [1][2][3][4] The PSHE is rising as a promising platform for novel photonic functions and can be applied in numerous applications, [5][6][7][8] such as identifying the graphene layer numbers, [9] precise measurement of optical conductivity of atomically thin crystal, [10] detection of chemical reaction rate, [11] and measurement of ion concentration. [12] More recently, the PSHE has also been applied in high-contrast edge imaging.…”

Section: Introductionmentioning

confidence: 99%

Asymmetrical photonic spin Hall effect based on dielectric metasurfaces

Geng¹,

Pan²,

Zhu³

et al. 2022

Chinese Phys. B

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The photonic spin Hall effect has attracted considerable research interest due to its potential applications in spin-controlled nanophotonic devices. However, realization of asymmetrical photonic spin Hall effect is still a challenge with a single optical element due to the conjugation of Pancharatnam-Berry phase, which reduces the flexibility in various applications. Here, we demonstrate an asymmetrical spin-dependent beam splitter based on a single-layer dielectric metasurface exhibiting strong and controllable optical response. The metasurface consists of an array of dielectric nanofins, where both varying rotation angles and feature sizes of the unit cells are utilized to create high-efficiency dielectric metasurfaces, which enables to break the conjugated characteristic of phase gradient. Thanks to the superiority of the phase modulation ability, when the fabricated metasurface is under normal incidence with 1550 nm in wavelength, the LCP light exhibits an anomalous refraction angle of 28.9°, while the RCP light transmitted directly. The method we propose can be used for the flexible manipulation of spin photons and has potentials in high efficiency metasurfaces with versatile functionalities, especially with metasurfaces in a compact space.

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Spin Hall effect of light reflected from a magnetic thin film

Cited by 37 publications

References 21 publications

Giant and controllable in-plane spin angular shifts in bulk and ultrathin magnetic materials

Giant and controllable in-plane spin angular shifts in bulk and ultrathin magnetic materials

Spin separations in the spin Hall effect of light

Asymmetrical photonic spin Hall effect based on dielectric metasurfaces

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