High-Efficiency Polarization Multiplexing Metalenses

Abstract

The polarization multiplexing technique is a well-established method that improves the communication capacity of an optical system. In this paper, we designed orthogonal linear and circular polarization multiplexing metalens using a library of rectangle TiO2 nanostructures. The former can independently focus x- and y-linearly polarized incident lights to designed positions with a focusing efficiency of 53.81% and 51.56%, respectively, whereas the latter with two preset focal points can independently control left and right circularly polarized incident lights with a focusing efficiency of 42.45% and 42.46%, respectively. We also show that both metalenses can produce diffraction-limited focal spots for four polarization states with no obvious distortion, which opens up new applications in polarization imaging and polarization detection.

Tunable polarimetric sensitive terahertz absorber

“…In 2022, Wang et al proposed a switched multifunctional terahertz absorber based on graphene and vanadium dioxide, whose absorption amplitude could be adjusted from 95% to 20% by changing the Fermi level of graphene [17]. However, these absorbers are not polarization sensitive, and for polarization imaging [18], selective spectral detection [19] and polarization multiplexing [20], etc., they have two high absorption peaks in orthogonal directions at different operating frequencies, so it is meaningful to study polarization sensitive tunable absorbers in this paper.…”

Broadband Achromatic Metalens in the Visible Light Spectrum Based on Fresnel Zone Spatial Multiplexing

“…It manipulates the phase, polarization, and amplitude of light by precisely tailoring the geometry and rotation of nanostructures [ 4 , 5 , 6 , 7 , 8 ]. Therefore, metasurfaces are used to develop various miniature optical devices, such as metalenses [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ], holograms [ 39 , 40 , 41 ], waveplates [ 42 , 43 ], and optical vortices [ 44 , 45 ]. Metalenses are one of the most important applications of metasurfaces.…”