Single-celled metasurface for labeled vortex beam generator

Liang, Congling; Dai, Qi; Huang, Tian; Liu, Hong-Chao; Guan, Zhiqiang; Fu, Rao; Tao, Jin; Li, Zile; Yu, Shaohua; Zheng, Guoxing

doi:10.1016/j.jmat.2023.09.013

Cited by 1 publication

(1 citation statement)

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“…We next discuss the metasurface used to generate the solenoid beam. Metasurfaces, consisting of subwavelength structures engineered to manipulate light, have emerged as powerful tools in optics, demonstrating versatility in various applications such as second and third harmonic generation, − metalenses − and metaholograms. − Recently, metasurfaces have also been used to generate vortex beams, adding to their extensive range of capabilities. − Our metasurface is a Pancharatnam–Berry type (i.e., geometric phase) and based on a-Si nanopillar meta-atoms. Efficient incident beam phase modulation thus requires that the meta-atom should act like a halfwave plate. , A schematic illustration of the meta-atom is shown in Figure a.…”

Section: Resultsmentioning

confidence: 99%

High Efficiency Triple-Helix Solenoid Beam Generated by Dielectric Metasurface

Setareh,

De Gille,

Cadusch

et al. 2024

ACS Photonics

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Solenoid beams are structured beams exhibiting patterns of light that rotate around the axis of propagation. They can exert forces on objects in a direction opposite to the light propagation direction and are thus referred to as tractor beams. Previous studies have produced solenoid beams using spatial light modulators (SLMs), but cost, weight, and size limit their widespread application. Here, we experimentally demonstrate a silicon metasurface that generates a triple helix solenoid beam. The beam is equivalent to the superposition of Bessel beams with orbital angular momentum (OAM) values of −10 and −7 and internal angles of 0.005 and 0.004 rad, respectively. Our metasurface demonstrates a diffraction efficiency of >90% and a transmission of >75%, a significant improvement over SLMs. We map the beam's intensity profile at up to ∼21 cm from the metasurface, showing its triple helix profile with negligible diffraction. We furthermore experimentally investigate interference between the solenoid beam and a Gaussian beam. This allows us to unravel the OAM information embedded in our two-component solenoid beam.

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