Article
Materials Science, Multidisciplinary
Jingjing Huang, Xiaona Yin, Man Xu, Meng Liu, Yuping Zhang, Huiyun Zhang
Summary: This study demonstrates a switchable coding metasurface in the terahertz frequency range for dynamic beam steering. By changing the Fermi level of the Dirac semimetal film, the relative phase delay of the metamaterials unit cell can be actively controlled, allowing for engineering of beam numbers and propagation direction. Furthermore, a 2-bit coding metasurface based on microstructures is constructed to achieve more sophisticated beam manipulation.
RESULTS IN PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Xufeng Wang, Xunjun He, Jiuxing Jiang, Yongtao Yao, Guangjun Lu
Summary: In this paper, a reflective hybrid graphene-metal coding metasurface is proposed for programmable manipulation of terahertz beams. The meta-atoms are composed of different C-shaped metallic split-ring resonators integrated with graphene, enabling different coding states through rotation and doping of graphene. The coding metasurfaces can achieve various functionalities including beam deflection, diffusive scattering, and vortex beam by changing the coding patterns. Dynamic reconfiguration is also possible by tuning the Fermi energy of graphene. The proposed coding metasurfaces have great potential in applications such as terahertz sensing, display, telecommunication, and imaging.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Computer Science, Information Systems
Hang Zhang, Liming Si, Tianyu Ma, Lin Dong, Rong Niu, Xiue Bao, Houjun Sun, Jun Ding
Summary: A triple-band terahertz chiral metasurface is proposed in this study, which achieves spin-selective absorption effect and efficient independent phase manipulation. The mechanism of absorption effect in different frequency bands is explained through simulations, and the manipulation of reflection phase is realized by introducing Pancharatnam-Berry phase.
Article
Optics
Houjiao Zhang, Ye Liu, Zhengqi Liu, Xiaoshan Liu, Guiqiang Liu, Guolan Fu, Junqiao Wang, Yun Shen
Summary: This work presents an efficient polarization conversion device using a hollow graphene metasurface, which can achieve excellent performances such as broadband x-to-y cross polarization conversion, dual-frequency linear-to-circular polarization conversion, and highly sensitive polarization conversion function manipulation. Through tuning the Fermi energy of graphene, different polarization conversion functions can be switched, with a high frequency shift sensitivity observed.
Article
Physics, Multidisciplinary
Min Zhong, Jiu-Sheng Li
Summary: The novel metasurface based on a combined pattern of outer C-shaped ring and inner rectangular ring can flexible manipulate terahertz waves and has various functionalities such as beam splitting and wave deflection.
Article
Chemistry, Physical
Yumin Gong, Fangrong Hu, Mingzhu Jiang, Longhui Zhang, Yingchang Zou, Guobao Jiang, Yongchen Liu
Summary: This study presents a THz binary encoder based on graphene metasurface, which achieves separate modulation of each passband by electrically adjusting the Fermi energy of graphene. The function of THz frequency range binary coding is realized, laying a new foundation for the development of multifunctional integrated THz devices.
Article
Chemistry, Analytical
Yin Zhang, Yijun Feng, Junming Zhao
Summary: In this paper, a tunable metasurface based on graphene is proposed, which can manipulate the dispersion of broadband terahertz waves by changing the Fermi level of graphene. It is demonstrated that the metasurface acts as a planar prism and a planar lens with excellent performance.
Article
Optics
Bin Ren, Shuai Tang, Yuxin Feng, Ying Cui, Jinlai Liu, Jie Song, Yongyuan Jiang
Summary: This study proposes a reconfigurable anisotropic coding metasurface composed of a graphene layer and anisotropic Jerusalem-cross metallic layer for dynamic and complete multi-channel terahertz wavefront manipulation. By controlling the Fermi energy of graphene, continuous amplitude modulation is achieved for the coding elements. By arranging anisotropic phase coding elements with a specific coding sequence and changing the Fermi energy of graphene, the metasurface can dynamically control multi-channel reflection beams and manipulate the scattering pattern.
Article
Physics, Applied
Taofeng Wang, Benwen Chen, Jingbo Wu, Shengxin Yang, Ze Shen, Jiacheng Cai, Weili Li, Caihong Zhang, Biaobing Jin, Jian Chen, Peiheng Wu
Summary: In this study, a transmission metasurface with complementary structure based on Babinet's principle was designed for THz beam steering by encoding 0 and 1 elements with different phase responses. The directional pattern of steered THz beams was characterized using THz time-domain spectroscopy and spectral imaging systems. Experimental measurements of beam deflection confirmed the performance consistency of the proposed metasurface.
APPLIED PHYSICS LETTERS
(2021)
Article
Optics
Zhong Min, Li Jiu-sheng
Summary: This study proposes a notched concave metasurface that can generate multifunctional vortex beams and adapt to different polarizations. The designed metasurface has potential applications in flexible manipulation of orbital angular momentum and polarization detection of terahertz waves in future terahertz wireless communications.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Zexu Guo, Yulong Zhou, Huanhuan Yang, Sijia Li, Tong Li, Xiangyu Cao
Summary: This paper demonstrates a programmable multifunctional metasurface with the ability to manipulate polarization, phase, and amplitude simultaneously. By controlling coding states and incident wave direction, it can function as a transmission cross-polarization converter, spatial wave manipulator, and low-RCS radome.
Article
Chemistry, Multidisciplinary
Yumin Gong, Baogang Quan, Fangrong Hu, Longhui Zhang, Mingzhu Jiang, Shangjun Lin
Summary: This study experimentally demonstrates a graphene metasurface for THz field enhancement by adjusting the conductivity of the graphene patch. The results show enhancement of the THz field and provide a foundation for exploring THz-matter interactions and nonlinear optics.
Article
Physics, Multidisciplinary
Yafeng Lu, Chen Wang, Shiqiang Zhao, Yongzheng Wen
Summary: Graphene is proposed as a platform for THz devices, and a graphene-based THz metasurface using cut-wire arrays is introduced for magnetic manipulation of THz waves. This structure allows efficient tuning of the metasurface response, making it suitable for applications such as compact THz modulators and magnetic field sensors.
FRONTIERS IN PHYSICS
(2021)
Article
Physics, Multidisciplinary
Hong Wang, Fangrong Hu, Xinlong Xu, Yumin Gong, Mingzhu Jiang, Longhui Zhang, Yingchang Zou
Summary: In this study, a THz dynamic large phase modulator based on graphene-metal hybrid metasurface was proposed, which can achieve dynamic tunable phase shift of more than 150 degrees. By modifying the structural parameters, a phase shift of 170 degrees can be achieved in a bandwidth of 50 GHz. The physical mechanism of the dynamic phase modulator was investigated, and the relationship between phase shift and Fermi level was established theoretically. This study paves a new way for realizing dynamic large phase modulation, which is crucial for THz broadband wireless communication, high-resolution imaging, and radar systems.
Article
Materials Science, Multidisciplinary
Cheng Huang, Jianming Liao, Chen Ji, Jinqiang Peng, Liming Yuan, Xiangang Luo
Summary: Reconfigurable metasurfaces with independent control of reflection magnitude and phase have been developed in this study. The reflection magnitude is controlled by a graphene capacitor structure, while the reflection phase is tuned by PIN diodes loaded in a periodic metallic structure. Good agreements between simulations and experiments demonstrate the powerful ability of this metasurface to manipulate EM waves.
ADVANCED OPTICAL MATERIALS
(2021)
