Tunable Transmissive Metastructure for Precise or Broadband Polarization Conversion Modulation Based on Graphene

• Published in: Annalen der Physik Vol. 535; no. 3
• Main Authors: Li, Yu‐Peng, Xia, Ke, Zhang, Lei, Zhang, Hai‐Feng
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.03.2023
• Subjects: Broadband; Conversion; Correlation analysis; Electromagnetic radiation; Fabry-Perot interferometers; Fabry–Perot cavities; Graphene; polarization conversion; Polarization modulation; Principles; Resonance; Terahertz frequencies; tunable metastructures
• ISSN: 0003-3804; 1521-3889
• DOI: 10.1002/andp.202200491

Based on the principle of Fabry–Perot (F–P) cavity resonance and the selective permeability of gratings to specific electromagnetic waves, a graphene‐based metastructure (MS) is proposed for transmissive polarization conversion (PC). Using the full‐wave numerical simulation, it is found that by varying the Fermi energy of graphene, the effective resonance range of the suggested MS can be dynamically adjusted from 0.47 to 0.348–0.714 THz, achieving the target of precise to ultra‐broadband polarization modulation. In this paper, the plausibility of the structure is verified from multiple perspectives, and the correlation analyses of the electric and magnetic fields are the supporting illustrations. Additionally, the triggering mechanism of PC is visually illustrated in the study of the surface currents distributions. Simulation results reveal that the MS is superior in performance, functionality, and principle, and it is foreseen to hold excellent promise for integrated equipment in the terahertz (THz) band. The image shows the amplitude curves and the performance curves when the Ef is at 0.1 and 1.0 eV, respectively. A tunable transmissive PC MS with dynamic operating bands based on the exotic physical properties of graphene can be obtained.