Efficiency tunable terahertz graphene metasurfaces for reflective single/dual-focusing effects based on Pancharatnam-Berry phase

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics Pub Date : 2024-10-01 DOI:10.1016/j.rinp.2024.108003

Wenzhi Yang , Lingling Yang , Bin Cai , Ling Wu , Siqi Feng , Yongzhi Cheng , Fu Chen , Hui Luo , Xiangcheng Li

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Abstract

In this paper, an efficiency tunable reflective metasurface (MS) consisting of a dielectric substrate sandwiched between hollow Z-shaped (HZS) structure graphene and a metallic ground plane is proposed for single/dual-focusing effects based on Pancharatnam-Berry (PB) in terahertz (THz) region. Numerical simulations demonstrate that the designed HZS graphene can achieve a circular polarization (CP) conversion with efficiency of approximately 98 % at a Fermi energy level (E_F) of 1.0 eV. Moreover, by adjusting the rotation angle of the HZS graphene, a full 0-2π phase coverage can be achieved. Of note, the simulation results also reveal that the reflective CP conversion efficiency is highly dependent on the value of the E_F. By carefully designing the spatial phase distribution of the graphene MS, tunable reflective single/dual-focusing effects can be realized, with focusing efficiency controlled by the E_F. It is anticipated that the proposed tunable graphene MS will have broad applications in communications, imaging, and others in THz domains.

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基于 Pancharatnam-Berry 相的反射式单/双聚焦效应的效率可调太赫兹石墨烯元表面

本文提出了一种效率可调的反射元表面 (MS)，它由夹在空心 Z 形 (HZS) 结构石墨烯和金属地平面之间的介质基板组成，用于太赫兹 (THz) 区域基于 Pancharatnam-Berry (PB) 的单/双聚焦效应。数值模拟证明，在费米能级（EF）为 1.0 eV 时，所设计的 HZS 石墨烯可实现圆偏振（CP）转换，效率约为 98%。此外，通过调整 HZS 石墨烯的旋转角度，还可以实现 0-2π 相位的全覆盖。值得注意的是，模拟结果还表明，反射式 CP 转换效率与 EF 值有很大关系。通过精心设计石墨烯 MS 的空间相位分布，可以实现可调的反射式单/双聚焦效果，聚焦效率由 EF 控制。预计所提出的可调石墨烯 MS 将在太赫兹领域的通信、成像和其他方面有广泛的应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY

CiteScore

8.70

自引率

9.40%

发文量

754

审稿时长

50 days

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