Compact Terahertz Dielectric Folded Metasurface

Abstract

Despite modern terahertz (THz) systems benefit from the developments in metasurfaces with flexible wavefront manipulation capabilities, the large propagation space between the THz source/detector and metasurface component, as well as the inherent insertion loss of metasurfaces, are the two main bottlenecks that hinder metasurface‐based THz devices from becoming a practical technology. This article addresses these two problems by demonstrating a compact, high‐efficiency folded metasurface system in the THz band. The device comprises two parallel dielectric metasurfaces, between which the THz waves are confined to reduce the system volume. The bottom reflective metasurface consists of an array of anisotropic dielectric resonators, which can simultaneously manipulate THz waves’ phase and polarization properties. The upper metasurface is a dielectric Bragg polarizer that selects the desired linear polarization of THz waves to pass through. Low‐loss and nondispersive high‐resistivity silicon is used as the material for both metasurfaces in this design, which is essential to achieving high efficiency. The compact and high‐efficiency folded THz metasystem is further experimentally verified. The introduced folded device can be used in diverse applications such as high‐speed THz communications, non‐destructive detection, and imaging systems, significantly reducing their volume and increasing their radiation efficiency.

Magnetic induced terahertz modulation characteristics based on ferromagnetic nematic liquid crystals

“…A terahertz (THz) [1][2][3][4][5][6] wave is an electromagnetic wave with the frequency range of 0.1-10 THz and the wavelength range of 0.03-3 mm, which is a promising frequency range in the electromagnetic spectrum. In recent times, THz technology have made great progress in basic research fields such as biological diagnosis, medical imaging, and wireless communication [7][8][9][10][11].…”

Electric-driven flexible-roller nanoimprint lithography on the stress-sensitive warped wafer

“…and detection [11][12][13]. Nano-patterning the surface of optoelectronic devices has attracted extensive concern [14][15][16].…”

Terahertz modulation characteristics of three nanosols under external field control based on microfluidic chip

“…Terahertz (THz) wave ( Cong et al., 2021 ; Tseng et al., 2020 ; Zhu et al., 2021 ; Lu et al., 2021 ) refers to an electromagnetic wave with a frequency of 0.1–10 THz and a wavelength of 0.03–3 mm, with a frequency band between millimeter waves and infrared light. Because of their wide bandwidth, low photon energy, and fingerprint spectral properties, THz waves have a wide range of application prospects in basic research fields, such as wireless communication, medical imaging, and biological diagnosis ( Li et al., 2022 ; Jia et al., 2022 ; Dong et al., 2022 ; Wang et al., 2022a , 2022b , 2022c ).…”