In this paper, we study the Imbert-Fedorov shifts of anisotropic two-dimensional atomic crystal. This beam shift is an out-plane shift which can manifests as spin-dependent splitting. The Imbert-Fedorov shift related to the crystal axis direction, conductance, and doping concentration of two-dimensional atomic crystal is discussed. In particular, our study found that the shifts at the black phosphorus interface are sensitive to the change of its optical axis angle, doping concentration and frequency. We believe the precise measurement of the sensitive parameters through quantum weak measurement technology would provide important theoretical guidance for the electromagnetic characterization of two- dimensional atomic crystals.
The optical Magnus effect for vortex beam reflection at an air-glass interface is investigated. A vector field model to describe the rotation properties of vortex beam is established, which clearly shows that the orbital momentum currents of the beams lead to a rotation of their intensity pattern, quite different from the rotation properties in free space. Particularly, the circulation direction of orbital momentum currents is the same to the rotation direction of the beam centroid, and the circulation direction of orbital momentum currents are inverse for the incident and reflected beams. The rotation properties are topological-dependent, and the rotation angle of the beam centroid increases and the rotation velocity of the beam centroid decreases as the propagation distance increases.
We propose and experimentally demonstrate an approach to generate and manipulate the circular Airy vector beams by a spatial light modulator and metasurfaces. It is found that the metasurface can realize the rotational symmetry reserved transmission of the circular Airy vector beams, which is stemmed from the rotational symmetry of circular Airy beam and cylindrical vector beams. The study may provide an alternative way for generating and manipulating of the circular Airy vector fields, which is primary based on the dielectric metasurface.
This paper presents a novel method for generating Hermite-Laguerre-Gaussian beams based on a spiral phase plate and a metasurface. The spiral phase plate is used to generate and modulate the dynamic phase, which has been used to generate the Laguerre Gaussian beam. The metasurface of the spatial variation can modulate the geometric phase for generating the Hermite Gaussian beam. We found Pancharatnam-Berry phase changed over the propagation of Hermite-Laguerre-Gaussian beams in free space, and the beam rotated around the phase singularities, the chirality of circular polarization of the incident beam will change. The theoretical analysis results are verified by a simple experimental system. The Pancharatnam-Berry phase provides a new degree of freedom. The study provides the theoretical and experimental basis for manipulating of the vortex light field based on the metasurface.
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