On anomalous optical beam shifts at near-normal incidence

Mazanov, Maxim; Yermakov, Oleh; Bogdanov, Andrey; Lavrinenko, Andrei

doi:10.1063/5.0111203

Cited by 10 publications

(2 citation statements)

References 41 publications

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“…When circularly polarized light is reflected from a generic interface, it produces two modes: a spin-maintained (normal) mode and a spin-flipped (abnormal) mode, which exhibit distinct transverse displacements. These displacements can be interpreted by the geometric phase theory [5,8,28,29,[31][32][33][34]. As such, the transverse PSHE results from the splitting between centroids of the LCP and RCP reflected light waves.…”

Section: Introductionmentioning

confidence: 99%

Revisiting physical mechanism of longitudinal photonic spin splitting and Goos-Hänchen shift

Zhen,

Wang,

Ding

et al. 2024

New J. Phys.

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The intrinsic connection between the transverse photonic spin Hall effect (PSHE) and the Imbert-Fedorov shift has been well characterized. However, physical insights into the longitudinal spin splittings associated with the Goos-Hänchen (GH) shift remain elusive. This paper aims to expand on the theory of the PSHE generation mechanism by examining the reflection of each spin component from an arbitrarily linearly polarized incident Gaussian beam on the air-dielectric interface in the longitudinal case. Unlike the transverse case, both spin-maintained and spin-flipped modes exhibit non-zero longitudinal displacements, with the latter being affected by the second-order expansion term derived from the in-plane wave-vector component. The polarization angle plays a crucial role in determining the longitudinal PSHE since each reflected total spin component is a coherent superposition of these two corresponding modes. Remarkably, the imaginary part of the relative permittivity of the dielectric significantly affects the symmetry of the longitudinal PSHE. Furthermore, the GH shift results from a superposition of individual spin states' longitudinal displacements, taking into account their energy weights. By incorporating the corresponding extrinsic orbital angular momentum, this paper explores the physical mechanism of the longitudinal PSHE. This unified physical framework provides a comprehensive understanding of the fundamental origin of spin separations and beam shifts, paving the way for potential applications in spin-controlled nanophotonics.

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Section: Introductionmentioning

confidence: 99%

Revisiting physical mechanism of longitudinal photonic spin splitting and Goos-Hänchen shift

Zhen,

Wang,

Ding

et al. 2024

New J. Phys.

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“…The spin Hall effect of light is applied in identifying graphene layers [14], measuring 2D material optical constants [15], differential microscopy [16], precision metrology [17,18], and so on [1,19]. Under certain conditions, the longitudinal and transverse shifts of the optical beams may be highly anomalous, i.e., larger than the incident wavelength, such as when using space-varying PB phases in homogeneous media [20], exploring exceptional points in PT-symmetric structures [21], or using the singularity in the Berry phase appearing in the beam Fourier spectrum [22].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Spin Hall Shift by Multipoles of Different Orders in Spherical Particles

Gao

2023

Photonics

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The spin–orbit interaction of light is universal in the process of light scattering, and an important aspect is the spin Hall effect. The spin Hall effect of light also exists in a three-dimensional (3D) system. When circularly polarized light is incident on a spherical particle, the transverse displacement of the particle relative to the scattering plane can be observed due to the spiraling of the Poynting vector in the far field. In general, the spin Hall shift of light is negligible and difficult to detect in experiments. In this paper, we use a high-refractive-index (HRI) core-shell structure to excite high-order multipoles and explore the interaction between different order multipoles to enhance the spin Hall shift in the microwave band. We show that there exist some angles that increase the spin Hall shift when two particular multipoles are equal and dominated. Our work provides a new perspective for understanding the interaction between light and particles and enhances the spin Hall shift of the sphere in the microwave band.

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