Article
Chemistry, Multidisciplinary
Shan Yin, Dehui Zeng, Yuting Chen, Wei Huang, Cheng Zhang, Wentao Zhang, E. Yiwen
Summary: Researchers have proposed an optically controlled dynamic beam splitter with adjustable split ratio in the terahertz region for the first time. The beam splitter achieves dynamic modulation of the split ratio using metasurfaces and a spatial light modulator, while maintaining stable split angles.
Article
Optics
Erich N. Grossman, Daniel Feldkhun, Sean McComb, Kelvin Wagner
Summary: We demonstrate the migration of a new type of structured-illumination imaging from the optical to the terahertz domain. This technique involves illuminating a target with rapidly moving sinusoidal fringes while measuring the scattered radiation on a single fast detector, enabling imaging of the target.
Article
Materials Science, Multidisciplinary
Jierong Cheng, Xipu Dong, Sai Chen, Yiwu Yuan, Qiye Wen, Shengjiang Chang
Summary: This study proposes an accordion-shaped single-element metagratings for THz beam scanning and angle-adaptive retroreflection. Dynamic beam steering is achieved through mechanical compression and rotation, allowing for beam scanning in a plane and over the 3D space. The study also investigates an angle-adaptive retroreflector with near perfect diffraction efficiency.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jing Lou, Xing Xu, Yindong Huang, Ying Yu, Jun Wang, Guangyou Fang, Jiangang Liang, Chunhai Fan, Chao Chang
Summary: Arming metasurface with active materials provides a feasible solution for dynamically controlling THz waves, essential for the upcoming sixth generation telecommunications. This study demonstrates a germanium (Ge) hybrid Fano metasurface under dual-stimulus control, achieving significant reduction in pump threshold and increased THz amplitude modulation.
Article
Chemistry, Multidisciplinary
Cormac McDonnell, Junhong Deng, Symeon Sideris, Guixin Li, Tal Ellenbogen
Summary: In this study, broadband THz plasmonic metagrating emitters were realized for simultaneous beam steering and all-optical linear polarization control. Two types of metagratings were designed and experimentally demonstrated, showing complete control over the linear polarization direction of the emitted THz waves. These functional THz metagratings hold great potential to meet the challenges associated with current diverse applications utilizing THz technology.
Article
Engineering, Electrical & Electronic
Feng Zhao, Jiashuai Xu, Zhengyong Song
Summary: This paper utilizes graphene-based Pancharatnam-Berry metasurfaces to achieve beam steering in the terahertz band, designing metasurfaces that can generate multiple beams in space.
IEEE PHOTONICS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Shen Zheng, Chao Li, Shiyou Wu, Hongwei Li, Guan Yang, Guangyou Fang
Summary: In this study, a transmissive planar binary periodical structure metasurface was utilized to achieve frequency-controlled beam scanning, with a proposed method for efficient beam steering. The designed metasurface demonstrated a scanning angle of 12.5 degrees with high transferring efficiency, offering advantages of low cost, simple design, and fabrication for potential applications in terahertz imaging, target detections, and communications.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Weili Li, Benwen Chen, Xinyu Hu, Hangbing Guo, Sheng Wang, Jingbo Wu, Kebin Fan, Caihong Zhang, Huabing Wang, Biaobing Jin, Jian Chen, Peiheng Wu
Summary: Electrically controlled terahertz beamforming antennas are crucial for wireless communications, security checks, and radar, improving coverage and information capacity. Programmable metasurfaces offer a flexible and cost-effective platform for terahertz beam steering, but scaling the arrays to achieve high-gain beam steering poses technical challenges. Researchers propose a pixelated liquid crystal terahertz metasurface with a crossbar structure, enabling array scale-up to over 3000. The programmable liquid crystal metasurface demonstrates active beam deflection in the upper half-space, opening possibilities in pencil beamforming, high-speed information processing, and optical computing.
Review
Engineering, Electrical & Electronic
Yasuaki Monnai, Xuyang Lu, Kaushik Sengupta
Summary: Free-space transmission of THz waves provides great opportunities for wireless applications in the 6G era and beyond. While THz waves enhance information capacity and spatial resolution, they also suffer from severe path loss. Beam steering, implemented through active/passive phased arrays or diffractive/frequency dispersive structures, is crucial for compensating path loss. Application-driven system design approaches, coupled with signal processing, have emerged to overcome hardware limitations.
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
(2023)
Article
Materials Science, Multidisciplinary
Fengyuan Yang, Thomas Caiwei Tan, Saurav Prakash, Abhishek Kumar, Ariando Ariando, Ranjan Singh, Nan Wang, Prakash Pitchappa
Summary: This article presents a solution for dynamic beam steering of terahertz waves in 6G networks using spatially-selective vanadium dioxide (VO2) patches and coding metasurfaces. The reversible and abrupt insulator-to-metal phase transition property of VO2 is exploited to achieve a reconfigurable transmission angle for terahertz waves. By designing metasurfaces with specific linear phase gradients and designer phase sequencing, electrically switchable beam steering is achieved. Further development of this concept will enable individual control of each active element, providing a complete 6G RIS solution for 3D terahertz beam manipulation.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Analytical
Ying Tian, Lichang Han, Li Yan, Jiayun Wang, Binzhen Zhang, Zan Jiao
Summary: In this paper, an optically-controlled multifunctional linear polarization conversion metasurface working in the terahertz band is proposed. The metasurface, designed with a multilayer structure and controlled by a photosensitive semiconductor, can achieve broadband reflection and transmission polarization conversion functions. The stability of the metasurface to structural parameters and incident angles is also discussed.
Article
Engineering, Electrical & Electronic
Jiashuai Xu, Wenwen Liu, Zhengyong Song
Summary: This paper presents a graphene-based coding metasurface for dynamic beam steering of terahertz waves, demonstrating its versatility in dynamically controlling electromagnetic waves. Experimental results verify the dynamic tunability of the proposed metasurface for various functionalities, showcasing its potential in terahertz wave applications.
IEEE PHOTONICS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Kazuto Sato, Yasuaki Monnai
Summary: Transmission of terahertz waves faces diffraction losses due to their shorter wavelengths, but a new strategy of steering the beams in two dimensions at around 300 GHz has been demonstrated. By using metal plates with a mesh surface and controlling the phase matching condition, the leaky-mode can be steered vertically and horizontally without relying on phase shifters.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2021)
Article
Optics
Zhiyu Tan, Fei Fan, Dan Zhao, Hao Wang, Shanshan Li, Shengnan Guan, Jie-Rong Cheng, Yunyun Ji, Shengjiang Chang
Summary: Magnetic Weyl semimetal has intriguing properties and potential applications. This research establishes a universal Chirality-Wavevector-Magnetic field relation in the magnetic Weyl semimetal system, which describes the spin topological band and its intrinsic polarization output under an arbitrary magnetic vector. Experiments demonstrate flexible THz beam steerings and nonreciprocal isolating transmission using this relation.
LASER & PHOTONICS REVIEWS
(2023)
Article
Computer Science, Information Systems
Xuan Liu, Lisa Schmitt, Benedikt Sievert, Jonas Lipka, Chong Geng, Kevin Kolpatzeck, Daniel Erni, Andreas Rennings, Jan C. Balzer, Martin Hoffmann, Andreas Czylwik
Summary: With the increasing potential uses of terahertz technology, the need for terahertz transceivers with application-oriented adaptive radiation patterns has emerged. This study proposes a MEMS-based reflectarray configured with a genetic algorithm to eliminate grating lobes and customize radiation pattern. The results demonstrate the effectiveness of the genetic algorithm in shaping the terahertz reflectarray and improving its performance.
