Article
Physics, Multidisciplinary
Dan Hu, Tian-Hua Meng, Hong-Yan Wang, Mai-Xia Fu
Summary: The designed tunable metamaterial absorber demonstrated dual-broadband high absorption properties at terahertz frequencies, with absorption rates reaching over 90%. By adjusting the graphene chemical potential, the absorptivity can be dynamically controlled from less than 10% to nearly 100%. The absorber is polarization-insensitive and robust to incident angles, showing potential for applications in THz imaging, modulating, filtering, etc.
Article
Optics
Xufend Jing, Guihong Qin, Peng Zhang
Summary: This study proposes a multi-functional metamaterial absorber based on doped silicon, which achieves broadband absorption through resonance and impedance matching, and precise amplitude control by controlling the pump luminous flux. By replacing the medium-doped silicon material with highly doped silicon material and combining it with microfluidic control, a high sensitivity sensor is realized. Experimental verification demonstrates the potential of this absorber in sensing applications.
PHOTONICS RESEARCH
(2022)
Article
Optics
Zongli Wang, Xin Wang, Junlin Wang, Huizhong Pang, Suyalatu Liu, Huqiang Tian
Summary: This paper introduces a graphene-based terahertz absorber with independently-tunable broadband absorption properties, achieving 90% absorption for both TE and TM polarizations in specific frequency ranges. The absorption can be continuously and independently controlled by changing the gate voltage, and the absorber is insensitive to the polarization state and maintains stability over a wide range of incident angles.
Article
Engineering, Electrical & Electronic
Seyyed Moin Alden Mostaan, Hamed Saghaei
Summary: This study introduces a new design of a broadband absorber using graphene, dielectric, and gold layers, which shows a significant increase in relative bandwidth compared to similar structures in recent years. The proposed absorber has a relatively simple fabrication process and can be used for far-infrared frequency range applications. The use of graphene in this metamaterial absorber allows for dynamic adjustability through electrostatic doping, offering potential applications in electro-absorption switches and modulators.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Optics
Pei-Jung Wu, Wei-Cheng Tsai, Chan-Shan Yang
Summary: In this study, an electrically tunable multi-band terahertz (THz) metamaterial filter based on graphene and multiple-square-loop structures was designed. The structure consists of multiple metal square loops of different sizes, which correspond to different THz frequencies, achieving the expected efficacy of a multi-band wave filter. By sweeping external voltages, the capability of the high-sensitivity THz filter can be modulated from single-band to multi-band filtering by changing graphene's Fermi levels. This hybrid THz wave filter study shows promise for the development of selecting channels in THz and 6G communications.
Article
Chemistry, Analytical
Jing Li, Yanfei Liu, Yu Chen, Wenqing Chen, Honglei Guo, Qiannan Wu, Mengwei Li
Summary: We propose a functionally tunable terahertz (THz) metamaterial absorber, which can switch between broadband-narrowband and dual-broadband near-perfect absorption. This switching performance is achieved through the phase transition of Vanadium dioxide (VO2) and the tunable electrical property of graphene. Computer simulation technology (CST) microwave study verifies the switching absorption properties. The proposed absorber has potential applications in THz range, such as switches, electromagnetic shielding, cloaking objects, filtering, sensing, etc.
Article
Materials Science, Multidisciplinary
Jun Zhu, Changsong Wu, Yihong Ren
Summary: The study proposed a metamaterial absorber composed of graphene, and demonstrated that dynamic tuning of the absorption range and absorption bandwidth could be achieved by adjusting the Fermi level of the graphene. This has theoretical and engineering significance in the domains of thermal photo-voltaics, solar cells, and sensors.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Yaqiang Zhang, Hongxing Dong, Nanli Mou, Haonan Li, Xin Yao, Long Zhang
Summary: The tunable and transparent metamaterial absorber with a water-based substrate demonstrates high absorptivity and optical transparency across a wide frequency range. It features indium-tin-oxide films, distilled water combined with PMMA, and the ability to further tune absorption properties by controlling substrate thickness. The device shows strong potential for military and medical equipment optical windows, with high polarization insensitivity and wide-incident-angle stability for both TE and TM polarization waves.
Article
Chemistry, Multidisciplinary
Hengli Feng, Zuoxin Zhang, Jingyu Zhang, Dongchao Fang, Jincheng Wang, Chang Liu, Tong Wu, Guan Wang, Lehui Wang, Lingling Ran, Yang Gao
Summary: This article proposed a dual broadband terahertz bifunction absorber that can be actively tuned to achieve perfect modulation of absorptance and absorption bandwidth. It also has the advantages of being polarization insensitive and maintaining stable absorption at wide angles of oblique incidence.
Article
Optics
Yulian Li, Wei Gao, Li Guo, Zihao Chen, Changjian Li, Haiming Zhang, Jiajia Jiao, Bowen An
Summary: A dynamically tunable ultra-broadband terahertz perfect metamaterial absorber based on vanadium oxide (VO2) has been proposed, with absorption bandwidth greater than 90% from 3.03 to 8.13 THz. By changing the conductivity of VO2, the absorption intensity can be dynamically tuned from 1.47% to 100%, showing significantly improved bandwidth and flexibility compared to previous reports.
Article
Physics, Applied
Zi-xiang Xu, Hai-yang Meng, An Chen, Jing Yang, Bin Liang, Jian-chun Cheng
Summary: A tunable low-frequency acoustic absorber composed of multi-layered ring-shaped microslit tubes with subwavelength thickness is proposed and experimentally verified, achieving high-efficient acoustic absorption and superior impedance manipulation capability. The proposed metastructure allows continuous tunability over a wide working frequency band and shows potential for practical engineering applications such as noise control.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Dagang Gong, Jinshuo Mei, Nianchao Li, Yuanchao Shi
Summary: In this paper, a tunable multilayer metamaterial absorber is proposed, which can achieve absorption in different frequency bands by adjusting the properties of VO2-graphene mixed structure layer and VO2 layer. The mechanism of VO2-graphene on the absorption performance is explained by studying the electric field distribution and equivalent impedance. Moreover, the absorber is insensitive to polarization and has potential application value in the terahertz field.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Nanoscience & Nanotechnology
Guishuang Yang, Fengping Yan, Xuemei Du, Ting Li, Wei Wang, Yuling Lv, Hong Zhou, Yafei Hou
Summary: In this work, a tunable broadband terahertz metamaterial absorber based on vanadium dioxide (VO2) is proposed. The simulation results demonstrate excellent absorption bandwidth and absorptivity, which can be dynamically adjusted by changing the conductivity of the material. The proposed absorber also exhibits the advantages of polarization and incident angle insensitivity, making it promising for applications in terahertz imaging, sensing, and detection.
Article
Engineering, Electrical & Electronic
Zhenyan Wei, Yannan Jiang, Shitian Zhang, Xiuqin Zhu, Qingliang Li
Summary: This study proposes a broadband absorber based on graphene and one-dimensional photonic crystal to achieve magnetically tunable broadband absorption in the terahertz frequency range. The performance analysis demonstrates that the proposed absorber operates in a wide frequency range with high absorption, and can be dynamically tuned by varying the magnetic field.
IEEE PHOTONICS JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Jing Tan, Yiyuan Xie, Junxiong Chai, Yichen Ye, Bocheng Liu, Xiao Jiang, Ye Su, Rong Yang, Yan Chen
Summary: In this paper, a novel graphene metamaterial is proposed, which can achieve both a tunable perfect absorber and a multifunctional logic device. The metamaterial consists of a gold substrate, a graphene flake, and a graphene double-strip-array on dielectric layers. The perfect absorption is achieved in the terahertz range based on the coupling between the two graphene layers, and the tunability is realized by varying the Fermi level of graphene. The multifunctional logic device, with OR, XNOR, NAND, and NOT gates, can be implemented in the terahertz domain by monitoring the reflections and comparing them with thresholds. The extinction ratios of the logic functions can be tuned by changing the other Fermi level of graphene. The straightforward structure and multiple functions of this metamaterial make it potentially applicable in terahertz optical communication.
RESULTS IN PHYSICS
(2023)
