Metamaterials for Terahertz Photonics: Enabling Novel Techniques

Dear Colleagues,

Terahertz waves have a wide range of promising applications in fields such as security inspections, material detection, and communications. With the development of terahertz photonics, various terahertz techniques have also emerged in recent years. Metamaterials, as subwavelength optical elements, have efficient and abundant modulation capabilities of electromagnetic waves. The design strategy of phase mutation is introduced at the interface, breaking the design limitation of traditional optical components. It provides significant convenience for controlling the wavefront of electromagnetic waves. Based on the generalized Snell law, researchers have proposed a variety of metasurface devices with rich functions, including meta-holography, metalens, vortex beams, vector polarization, surface waves, and so on.

This Special Issue welcomes both simulation and experimental research and addresses the latest progress on Metamaterials and Terahertz Photonics.

• Metasurfaces and metamaterials;
• Waveguides, fiber, and photonic crystals;
• Nanophotonics and plasmonics;
• Biophotonics;
• Structured light field modulation;
• Nonlinear and ultrafast optics;
• Integrated optics;
• Terahertz applications such as radars, wireless, and wired communications.

Dr. Chenglong Zheng
Dr. Hui Li
Guest Editors

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• terahertz
• metamaterials
• polarization

Title: A Dual-band Terahertz Absorber Based on Patterned Graphene
Authors: Xin Tang,1 Haoduo Jia,1 Jitao Li,1,2,3,4,* Dingyu Yang,1,*
Affiliation: 1College of Optoelectronic Engineering, Chengdu University of Information Technology, Chengdu, 610225, China 2School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China 3Guizhou Zhenhua Fengguang Semiconductor Co., Ltd., Guiyang 550000, China. 4Chengdu Huanyuxin Technology Co., Ltd., Chengdu 610095, Chengdu, China. * Corresponding author: [email protected] (J. Li); [email protected] (D. Yang)
Abstract: In recent years, metamaterial absorbers have shown tremendous potential applications. To address the issue of non-tunability in traditional metal absorbers, we propose an absorber based on patterned graphene. Simulation results demonstrate that the structure design combining circular and strip graphene on the top layer can achieve perfect absorption with dual-band operation that center frequencies are located at 0.548 THz and 1.678 THz, respectively. By varying the Fermi level and structural parameters of graphene, the absorption performance of the device can be effectively adjusted. The absorber exhibits excellent absorption performance over a wide range of incidence angles from 0 to 70°. Furthermore, due to the highly symmetric structure maintained during device design, it exhibits insensitivity to incident waves with polarization angles from 0 to 90°. These results indicate that the proposed graphene absorber holds broad prospects in frequency selective surfaces, biosensing, and object invisibility.