Generation of Concentric Space-Variant Linear Polarized Light by Dielectric Metalens
Journal
Nano Letters
Journal Volume
21
Journal Issue
1
Pages
562-568
Date Issued
2021
Author(s)
Chang W.-H., Lin J.-H., Kuan C.-H., Huang S.-Y., Lan Y.-W., Lu T.-H.
Lin J.-H
Kuan C.-H
Huang S.-Y
Lan Y.-W
CHIEH-HSIUNG KUAN
Abstract
Miniaturized flat and ultrathin optical components with spatial and polarization degrees of freedom are important for optical communications. Here, we use nanostructures that act as tiny phase plates on a dielectric metalens to generate a concentric polarization beam with different orientations along the radial direction. The important discoveries are that (1) the circularly polarized light can be converted into linearly polarized states with a different orientation at near field and that (2) this orientation is strongly correlated to the rotation of the nanostructures on the metalens. Stokes parameters are utilized to investigate the comprehensive polarization states embedded in the optical intensity along the propagation direction. The variation of the spatial polarization states transformed by the dielectric metalens can be properly mapped onto the Poincar? sphere. We believe that the variety of spatial polarizations within a miniaturized configuration provides a new degree of freedom for diverse applications in the future. ?
Subjects
Degrees of freedom (mechanics); Light polarization; Nanostructures; Optical communication; Circularly polarized light; Diverse applications; Linear polarized light; Optical components; Optical intensities; Polarization degree; Propagation direction; Spatial polarization; Metals
Type
journal article