Generation of elliptical airy vortex beams based on all-dielectric metasurface

Abstract

Elliptical Airy vortex beams (EAVBs) can spontaneously form easily identifiable topological charge focal spots. They are used for topological charge detection of vortex beams because they have the abruptly autofocusing properties of circular Airy vortex beams and exhibit unique propagation characteristics. In this paper, we study the use of the dynamic phase and Pancharatnam-Berry phase principles for the generation and modulation of EAVBs by designing complex-amplitude metasurface and phase-only metasurface, respectively, at an operating wavelength of 1500 nm. It is found that the focusing pattern of EAVBs in the autofocusing plane splits into |m|+1 tilted bright spots from the original ring, and the tilted direction is related to the sign of the topological charge number m. Due to the advantages of ultra-thin, ultra-light, and small size of the metasurface, our designed metasurface device has potential applications in improving the channel capacity based on orbital angular momentum communication, information coding, and particle capture compared to spatial light modulation systems that generate EAVBs.

A high-performance terahertz absorber based on synthetic-patterned vanadium dioxide metamaterials

“…Therefore, metamaterials have been widely used in stealth devices, 10 sensors, 11 communication devices, 12,13 and imaging devices 14 in recent years. Functional devices such as absorbers, [15][16][17] filters, 18 and modulators 19,20 based on metamaterials have also been proposed. Among them, terahertz absorbers have become a research hotspot in recent years, and significant progress has been made in thermal emitters, 21 detectors, 22,23 and solar absorbers.…”

Multi-channel generation of vortex beams with controllable polarization states and orbital angular momentum

“…Generally, propagating light waves possess two distinct forms of angular momentum. [5][6][7][8] Firstly, light can carry spin angular momentum (SAM). SAM is inherent in light beams with elliptical polarization states and depends on the field vector rotations that take place at every point of the beam crosssection.…”

High-performance terahertz absorber with tunable and ultra-broadband characteristics based on synthetic- patterned vanadium dioxide metamaterials

“…Therefore, metamaterials have been widely used in stealth device [10], sensor [11], communication [12], and imaging [13] in recent years. Functional devices such as absorbers [14][15][16], lters [17], and modulators [18,19] based on metamaterials have also been proposed. Among them, terahertz absorbers have become a research hotspot in recent years, and signi cant progress has been made in thermal emitter [20], detector [21], and solar absorber [22].…”