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Photonics
Volume 13
Issue 4
10.3390/photonics13040362
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Communication

Mid-Infrared Vortex Beam Generator Based on Planar Metamaterials

by
Wei Qiao
1,
Xiaoyang Guo
1,
Qipeng Wang
2,
Peng Liu
2,
Runze Yan
3,
Junyang Li
3,
Jie Sun
1,* and
Guiqiang Du
3,*
1
School of Airspace Science and Engineering, Shandong University, Weihai 264209, China
2
Aeronautical Science Key Laboratory for High Performance Electromagnetic Windows, AVIC Research Institute for Special Structures of Aeronautical Composites, Jinan 250023, China
3
School of Space Science and Technology, Shandong University, Weihai 264209, China
*
Authors to whom correspondence should be addressed.
Photonics 2026, 13(4), 362; https://doi.org/10.3390/photonics13040362
Submission received: 7 February 2026 / Revised: 24 March 2026 / Accepted: 7 April 2026 / Published: 9 April 2026
(This article belongs to the Section Optoelectronics and Optical Materials)
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Abstract

We designed a kind of new vortex beam generator based on a planar all-dielectric metamaterial in the mid-infrared band. The height of this generator remains constant in the plane, and the effective refractive index increases gradually in the azimuthal direction which depends on subwavelength aperture columns with gradual diameters in the dielectric flat plate. Two types of vortex beam generators including transmissive- and reflective-type generators are designed where the thickness of the latter is half of the former. Simulation results show that both vortex beam generators successfully produce mid-infrared vortex beams with a topological charge number of one. This planar vortex beam generator based on a dielectric metamaterial has the advantages of simple structure, easy processing and low optical absorption.
Keywords: metamaterials; planar metamaterials; vortex beam; gradual refractive index metamaterials; planar metamaterials; vortex beam; gradual refractive index

Share and Cite

MDPI and ACS Style

Qiao, W.; Guo, X.; Wang, Q.; Liu, P.; Yan, R.; Li, J.; Sun, J.; Du, G. Mid-Infrared Vortex Beam Generator Based on Planar Metamaterials. Photonics 2026, 13, 362. https://doi.org/10.3390/photonics13040362

AMA Style

Qiao W, Guo X, Wang Q, Liu P, Yan R, Li J, Sun J, Du G. Mid-Infrared Vortex Beam Generator Based on Planar Metamaterials. Photonics. 2026; 13(4):362. https://doi.org/10.3390/photonics13040362

Chicago/Turabian Style

Qiao, Wei, Xiaoyang Guo, Qipeng Wang, Peng Liu, Runze Yan, Junyang Li, Jie Sun, and Guiqiang Du. 2026. "Mid-Infrared Vortex Beam Generator Based on Planar Metamaterials" Photonics 13, no. 4: 362. https://doi.org/10.3390/photonics13040362

APA Style

Qiao, W., Guo, X., Wang, Q., Liu, P., Yan, R., Li, J., Sun, J., & Du, G. (2026). Mid-Infrared Vortex Beam Generator Based on Planar Metamaterials. Photonics, 13(4), 362. https://doi.org/10.3390/photonics13040362

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