Flexible terahertz optics: light beam profile engineering via C-shaped metallic metasurface

Frontiers in Physics

Physics

Sergej Orlov¹  Ernestas Nacius¹  Karolis Redeckas²  Matas Bernatonis²  Ignas Grigelionis²  Vladislovas Čižas²  Rusnė Ivaškevičiūtė-Povilauskienė²  Gintaras Valušis³  Linas Minkevičius³ 

[1]Department of Fundamental Research, Center for Physical Sciences and Technology, Vilnius, Lithuania

[2]Department of Optoelectronics, Center for Physical Sciences and Technology, Vilnius, Lithuania

[3]Department of Optoelectronics, Center for Physical Sciences and Technology, Vilnius, Lithuania

[4]Department of Physics, Institute of Photonics and Nanotechnology, Vilnius University, Vilnius, Lithuania

关键词: terahertz;    imaging;    metasurfaces;    compact imaging systems;    mechanical bending;    light profile engineering;   

DOI  :  10.3389/fphy.2023.1196726

 received in 2023-03-30, accepted in 2023-04-25,  发布年份 2023

来源: Frontiers

【 摘 要 】

The potential of terahertz (THz) imaging implementation in a large variety of applications requires compact, reliable, and relatively low-cost solutions in systems constituents. Here we focus on the development of passive optical elements and demonstrate flexible and reliable THz beam profile engineering for imaging aims via mechanical bending of a stainless steel-based C-shaped metasurface. The designed and laser-ablation technology fabricated metasurface provides compact THz focusing and enables THz light engineering as well as polarization control ability in THz imaging. Focusing, light profile engineering, and polarization control performances of the metasurfaces with different focal distances and C-shape designs are presented. Experimental data are well supported by simulations, using Finite Difference Time Domain (FDTD) method. THz images of different objects at ∼94 GHz using InP Gunn diode, bow-tie sensors, and exclusively metasurfaces-based optics are exposed. Further routes in the development of low-cost multicolor and polarization-sensitive THz imaging are discussed.

【 授权许可】

Unknown   
Copyright © 2023 Ivaškevičiūtė-Povilauskienė, Čižas, Nacius, Grigelionis, Redeckas, Bernatonis, Orlov, Valušis and Minkevičius.