Article
Optics
Azadeh Didari Bader, Hamed Saghaei
Summary: In this work, we propose two different graphene-covered nanostructured metamaterial absorbers inspired by Penrose tiling. These absorbers enable spectrally tunable absorption within the terahertz spectrum. The tunability of these absorbers is determined through finite-difference time-domain analyses. The findings show the high tunability of both models through varying graphene's Fermi level, thickness, substrate's refractive index, and proposed structures' polarization. Multiple tunable absorption profiles are observed, which may find applications in designer infrared absorbers, optoelectronic devices, and THz sensors.
Review
Materials Science, Multidisciplinary
Chuanxin Chen, Minqi Chai, Meihua Jin, Tao He
Summary: Terahertz metamaterial absorbers (TMAs) efficiently absorb electromagnetic waves in the range of 0.1-10 THz, achieving perfect absorption and broad band absorption. Their ultra-thin design and tunable electromagnetic properties make them highly valuable in communication, imaging, detection, and security inspection applications.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Nanoscience & Nanotechnology
Haoduo Jia, Xin Tang, Hui Li, Ziwen Qian, Ming Li, Dai Wu, Peng Li, Jianxin Wang, Xinghua Zhu, Dingyu Yang
Summary: By adjusting the graphene Fermi energy parameters, a tunable terahertz metamaterial absorber with nearly perfect absorption (100%) can be achieved. The distinct properties of graphene enable tunable terahertz absorption, and excellent absorption performance is maintained within a certain range of incident angles.
Article
Multidisciplinary Sciences
Somayyeh Asgari, Tapio Fabritius
Summary: In this paper, a graphene-based multi-functional anisotropic metamaterial is designed and proposed for the 0.1-5.5 THz region. Simulations are performed using the finite element method (FEM) and an equivalent circuit modeling (ECM) approach. The metamaterial exhibits polarization-sensitive behavior and can act as a THz switch, inverter, and bi-functional mirror. It has potential applications in future THz devices and systems.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
Miao Pan, Jiayi Weng, Bomeng Zhou, Jianzhi Su, Hao Tang, Baodian Fan, Linqin Jiang, Lingyan Lin, Yu Qiu
Summary: This paper proposes a tunable terahertz bandwidth metamaterial based on single-layer graphene, which has high absorption and polarization insensitivity. The metamaterial exhibits tunability and good stability, with wide potential applications.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Optics
Zhe Chen, Jinjiang Chen, Haowen Tang, Tao Shen, Hui Zhang
Summary: This paper proposes a terahertz absorber with a simple four-layered structure that can be dynamically switched between broadband and triple-band absorption by controlling the chemical potential of graphene. The absorber demonstrates high absorption efficiency, insensitivity to incident polarization, and shows potential in terahertz applications such as detectors, modulators, and sensors.
Review
Nanoscience & Nanotechnology
Taiichi Otsuji, Stephane Albon Boubanga-Tombet, Akira Satou, Deepika Yadav, Hirokazu Fukidome, Takayuki Watanabe, Tetsuya Suemitsu, Alexander A. Dubinov, Vyacheslav V. Popov, Wojciech Knap, Valentin Kachorovskii, Koichi Narahara, Maxim Ryzhii, Vladimir Mitin, Michael S. Shur, Victor Ryzhii
Summary: This paper reviews recent advancements in graphene-based plasmonic metamaterials for terahertz (THz) laser transistors. The researchers investigate various approaches using graphene plasmonic metamaterials to achieve room-temperature, dry-cell-battery operated intense THz lasing with fast direct modulation. The paper discusses device structures and design constraints for coherent light sources applicable to future THz wireless communication systems.
Article
Chemistry, Analytical
Runing Lai, Hao Chen, Zigang Zhou, Zao Yi, Bin Tang, Jing Chen, Yougen Yi, Chaojun Tang, Jianguo Zhang, Tangyou Sun
Summary: This paper introduces a new theoretical proposal for a surface plasmon resonance terahertz metamaterial absorber with five narrow absorption peaks. By controlling the properties of graphene, the absorption rates and frequencies can be dynamically adjusted. The design features dynamic tunability, wide absorption characteristics, and excellent sensitivity.
Article
Materials Science, Multidisciplinary
Ying Zhan, Chunzhen Fan
Summary: A tunable three-band absorber in the terahertz range has been proposed and studied using graphene strips. The position and intensity of three absorption peaks can be flexibly adjusted with different Fermi energy and chemical potential due to the unique properties of graphene. Moreover, an on to off modulation of perfect absorption is achieved with a high modulation degree, surpassing previous work. The highly tunable absorber has potential applications in controllable optical switchers, filters, detectors, and sensors.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Chemistry, Multidisciplinary
Jan-Christoph Deinert, David Alcaraz Iranzo, Raul Perez, Xiaoyu Jia, Hassan A. Hafez, Igor Ilyakov, Nilesh Awari, Min Chen, Mohammed Bawatna, Alexey N. Ponomaryov, Semyon Germanskiy, Mischa Bonn, Frank H. L. Koppens, Dmitry Turchinovich, Michael Gensch, Sergey Kovalev, Klaas-Jan Tielrooij
Summary: Nonlinear optics plays a crucial role in optical and optoelectronic technologies. The integration of graphene with a photonic grating structure has led to a significant enhancement in the third-harmonic generation in the terahertz regime. This enhancement opens up new possibilities for chip-integrated, room-temperature, and commercially viable THz nonlinear conversion applications.
Article
Spectroscopy
Jianjun Liu, Lanlan Fan, Jin Su, Senquan Yang, Huang Luo, Xuehua Shen, Fan Ding
Summary: This study designs and constructs a graphene-metamaterial absorber heterostructure, which can improve the detection sensitivity of trace samples and achieve accurate and rapid detection in the terahertz band.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Multidisciplinary
Meng Chen, Yingxin Wang, Ziran Zhao
Summary: The frequency spectra and polarization states of terahertz waves contain important physical and material information, and compact on-chip platforms are being investigated for capturing these quantities effectively. This paper presents a hybrid device that integrates photodetection, wavelength, and polarization selectivity into a single architecture, using the properties of metamaterials and graphene. The detector shows resonantly enhanced photoresponse at specific target wavelengths with orthogonal polarizations, and its versatile capabilities are demonstrated for spectrally selective and polarization resolved imaging on a single-chip platform without advanced optical components. This strategy benefits the future development of multifunctional, compact, and low-cost terahertz sensors.
Article
Engineering, Electrical & Electronic
Heming Yu, Peiwen Xiang, Yuanfeng Zhu, Shan Huang, Xingfang Luo
Summary: In this paper, a wide bandwidth polarization insensitive terahertz graphene metamaterial absorber is proposed. By optimizing the structure parameters, the absorber can achieve wide and strong absorption performance, and it is insensitive to polarization and incident angle.
IEEE PHOTONICS JOURNAL
(2022)
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, Physical
Yuwang Deng, Qingli Zhou, Pujing Zhang, Wanlin Liang, Tingyin Ning, Yulei Shi, Cunlin Zhang
Summary: The dual metamaterial induced transparency (dual-MIT) phenomenon is demonstrated in multifunctional terahertz metastructures with unequal-lengthed 3-bar arrays, where the depolarization field effect of graphene overlayer plays a significant role. These metasurfaces can actively manipulate phase, group delay, and polarization conversion at various frequencies. The introduction of graphene enhances the amplitude modulation of dual MITs and reduces the quenched power by 4 times with a rotated angle, enabling an ultrafast all-optical switch with 2-time enhancement in modulation speed. Encrypted imaging on the erasure and reappearance of target patterns is illustrated using the advantages of dual-MIT windows. This work provides a low power consumption option for ultrafast all-optical switch and opens up opportunities for future communication and information security in the terahertz regime.
