Abstract
Abstract
Drawing upon the physical phenomenon of polarization transformation, this paper proposes an ultra-broadband, high-efficiency linear polarization converter composed of a metallic grating, an L-shaped metallic patch, and a dielectric substrate. The polarization conversion properties have been scrutinized using the finite element numerical simulation software CST. The computational outcomes reveal that the polarization converter operates within the frequency range of 0.5 THz to 1.8 THz, exhibiting a relative bandwidth of 113%, a transmission coefficient exceeding 0.87, a polarization conversion efficiency approaching 100%, and a phase coverage spanning 360°. Furthermore, a Fabry–Perot interference model was established utilizing Matlab to corroborate the concurrence between the theoretical analysis and the numerical findings. The polarization converter metasurface amalgamates both phase and transmission amplitude variations to accomplish not only a two-dimensional focusing lens operating between 1.55 THz and 1.65 THz, but also a spatial imaging capability utilizing transmission amplitude variation within the 0.5 THz to 1.15 THz range. The outcomes demonstrate that the devised metasurface exhibits ultra-broadband and high transmission efficacy, thus providing novel insights for the versatility of terahertz wave polarization and phase manipulation.
Funder
the National Natural Science Foundation of China
Innovative Funds Plan of Henan University of Technology
Key Scientific and Technological Project of Science and Technology Department of Henan Province
Key Scientific Research Project of Henan Education Department
Key Laboratory of Grain Information Processing and Control (Henan University of Technology), Ministry of Education
Cultivation Plan for Young Key Teachers of Henan University of Technology
The “Double First-Class” Project for Postgraduate Academic Innovation Enhancement Programme of Henan University of Technology
The “Double First-Class” Project for Postgraduate-Cultivating, Innovation Platform Establishment Programme of Henan University of Technology
Subject
Condensed Matter Physics,Mathematical Physics,Atomic and Molecular Physics, and Optics