Generation of orbital angular momentum and focused beams with tri-layer medium metamaterial

doi:10.1088/1674-1056/abab79

Abstract

We propose a metal/dielectric tri-layer metamaterial for wavefront shaping. By arranging the element in an array with a constant phase gradient and irradiated it with a plane wave, focused and focused vortex beams can be obtained. The designed metamaterial features the excellent capability of focused/focused vortex beams generation within the operating frequency range of 30 GHz–34 GHz. The simulation results are consistent with the theoretical analyses.

Keywords: metamaterial phase shift wave-front shaping orbital angular momentum

Received: 10 May 2020
Revised: 08 June 2020
Accepted manuscript online: 01 August 2020

PACS:	41.20.Jb	(Electromagnetic wave propagation; radiowave propagation)
	42.25.Bs	(Wave propagation, transmission and absorption)
	92.60.Ta	(Electromagnetic wave propagation)

Corresponding Authors: ^†Corresponding author. E-mail: xubijun@zust.edu.cn

About author:

†Corresponding author. E-mail: xubijun@zust.edu.cn

* Project supported by the Natural Science Foundation of Zhejiang Province, China (Grant No. LY20F050001).

Cite this article:

Zhi-Chao Sun(孙志超), Meng-Yao Yan(闫梦瑶), and Bi-Jun Xu(徐弼军)† Generation of orbital angular momentum and focused beams with tri-layer medium metamaterial 2020 Chin. Phys. B 29 104101

Fig. 1.

(a) Scheme of the unit used in the design, (b) top view of the unit.

Table 1.

The radius a corresponding to the phase and transmission amplitude of our designed model.

Fig. 2.

The radius a corresponding to the phase shift and transmission amplitude at 32 GHz.

Fig. 3.

Panels (a) and (b) are the planes of focused and focused vortex metamaterial, panels (c) and (d) are the three-dimensional (3D) view of metamaterial arrays.

Fig. 4.

(a)–(c) Focused electric field distribution of the y–z plane at 30, 32, and 34 GHz. (d)–(f) Focused electric field distribution of the x–y plane at 30, 32, and 34 GHz. (g)–(i) Focused far-field pattern of the metamaterial at 30 GHz, 32 GHz, and 34 GHz.

Fig. 5.

(a)–(c) Simulation gains at 30 GHz, 32 GHz, and 34 GHz.

Fig. 6.

(a) Incident initial phase; (b) spiral phase; (c) total phase; (d)–(f) Focused vortex electric field distribution at 30, 32 and 34 GHz; (g)–(i) Simulation results of focused vortex phase at 30 GHz, 32 GHz, and 34 GHz.

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