Article
Materials Science, Multidisciplinary
Prakash Pitchappa, Abhishek Kumar, Ranjan Singh, Nan Wang
Summary: The study presents a frequency-agile THz bandpass transmission filter using electromechanically reconfigurable microcantilevers integrated complementary metamaterial. It offers a large tunable range, active switching of THz transmission frequency range, and is fabricated using CMOS compatible materials.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Physics, Condensed Matter
Tao Chen, Weijie Jiang, Xianhua Yin
Summary: This paper proposes a dual-band tunable absorber with a graphene-dielectric-metal structure as a sensor in the terahertz region, which achieves resonance frequency adjustment by tuning the chemical potential of graphene and exhibits polarization and angle insensitivity. Simulation results demonstrate the structure's maximum sensitivity, Q factor, and figure-of-merit, indicating promising applications in biomedical diagnosis and environmental monitoring.
SUPERLATTICES AND MICROSTRUCTURES
(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, 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
Materials Science, Multidisciplinary
Siyuan Liu, Xiaoxing Yin, Hongxin Zhao
Summary: This work presents a photo-excited terahertz metamaterial absorber (PETMA) that can be switched between single-band and narrow-band absorption. The PETMA consists of three layers, including a metal plate, a dielectric layer, and a top unit attached to the dielectric substrate. By controlling the conductivity of silicon using an optical pump beam, the PETMA can achieve single-band and narrow-band absorption at different frequencies. The simulations demonstrate that the proposed PETMA exhibits stable absorption performance at wider incident angles.
RESULTS IN PHYSICS
(2022)
Article
Optics
Ali Maleki, Avinash Singh, Ahmed Jaber, Wei Cui, Yongbao Xin, Brian T. Sullivan, Robert W. Boyd, Jean-Michel Menard
Summary: Octave-wide bandpass filters in the terahertz (THz) region based on bilayer-metamaterial (BLMM) structures are presented. The passband region has a super-Gaussian shape with a maximum transmittance of 70% and a stopband rejection of 20 dB. The filters were designed using finite-difference time-domain (FDTD) simulations and fabricated using a photolithography process. Experimental characterization shows good agreement with simulation results. The use of two superimposed BLMM (2BLMM) devices further enhances the roll-off steepness and stopband rejection while maintaining a high transmittance.
PHOTONICS RESEARCH
(2023)
Article
Automation & Control Systems
Jiancheng Dong, Kai Xu, Jin Shi
Summary: The article introduces a compact differential tunable dual-band bandpass filter with a tunable lower passband and a fixed upper passband. Compared with existing technology, it offers a wider tuning range, compact size, fewer control voltages, and a simple structure.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Jiahao Yang, Yu-Sheng Lin
Summary: Two types of refractive index sensors based on tunable terahertz metamaterials utilizing different geometric positions for resonance tuning were proposed, demonstrating flexibility in real applications and enhanced sensitivity in varying refractive index environments.
Article
Chemistry, Physical
Haonan Qi, Bin Tang
Summary: In this paper, a switchable and tunable functional metamaterial device based on hybrid graphene-vanadium dioxide (VO2) is proposed. By utilizing the metal-insulator transition properties of VO2, the proposed metamaterials can switch between tunable circular dichroism (CD) and dual-band perfect absorption in the terahertz region. The operation mechanism behind the phenomena can be explained by utilizing the electric field distribution and the coupled mode theory. The proposed switchable and tunable metamaterial provides a platform for designing versatile functional devices in the terahertz region.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Optics
Dongxu Wang, Kai-Da Xu, Siyuan Luo, Yuqing Cui, Liuyang Zhang, Zhen Liao, Jianlei Cui
Summary: In this paper, a dual-band terahertz absorber based on a metamaterial structure is designed, fabricated, and measured. The absorber achieves two absorption peaks at 0.715 and 1.013 THz with high Q-factors of 152.1 and 98.3, respectively, under TE and TM polarized incidence. The prototype of the metamaterial absorber is fabricated using electron beam lithography and electron beam evaporation technology, and its performance is tested using terahertz time-domain spectroscopy. This work offers a new option for designing multi-band terahertz metamaterial absorbers.
Article
Engineering, Electrical & Electronic
Yuan Chun Li, Di-Si Wu, Ting-Zhi Zhang, Quan Xue
Summary: This brief introduces compact dual-band dual-channel bandpass filters with different and identical frequency allocations. Four resonant modes are excited in the dielectric resonator due to the magnetic boundary condition. Dual-passband with different frequencies and bandwidths are obtained in each channel through analysis of the excitation and coupling scheme. High isolation between the two channels is guaranteed thanks to the two pairs of orthogonal degenerate modes and excitation principle. Two designed dual-band dual-channel BPFs achieve low insertion loss and high isolation better than 38 dB with only two DRs and two sets of probes in the same passbands, demonstrating the potential reduction in volume and number of resonators in massive input massive output communication systems with the proposed method.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Chemistry, Physical
Manikandan Esakkimuthu, Inbarani Jothinayagam, Karthigeyan Arumugam, Sheena Christabel Pravin, Mukesh Jewariya
Summary: This paper presents the design of a double-band terahertz metamaterial filter using a single conducting layer, achieving broadband characteristics. The design achieves resonance at 0.5 THz and 1.65 THz with broad bandwidths, and maintains transmission characteristics for different polarizations, tested at various angles of incidences. By replacing the top conductor layer with graphene and adding a silicon substrate, tunable resonant behavior was observed. The physical mechanism of the double-band behavior was confirmed through surface current distribution.
Article
Engineering, Electrical & Electronic
Claudio Porzi, Manuel Reza, Paolo Ghelfi, Marc Sorel, Antonella Bogoni
Summary: We report a silicon photonics flat-top bandpass microwave photonic filter with large out-of-band power rejection of over 40 dB and tunability of central frequency up to 70 GHz. The RF bandpass transfer function can be widely configured without sacrificing filter performance. The filter integrates a phase modulator and a tunable optical splitter to achieve a high level of functional integration.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
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
Chemistry, Multidisciplinary
Tong Wu, Guan Wang, Yang Jia, Yabin Shao, Chen Chen, Jing Han, Yang Gao, Yachen Gao
Summary: A bifunctional tunable metamaterial composed of pattern metal structure, graphene, and strontium titanate (STO) film is proposed and studied numerically and theoretically. The physical mechanism of the dual plasmon-induced transparency (PIT) was theoretically analyzed through a three-harmonic oscillator model, showing that the regulation function of the PIT peak results from the change of the oscillation damping at the dark state DSSRs by tuning the conductivity of graphene. This design provides a new structure to realize bifunctional optical switch and slow light effects through independent tuning of graphene properties and metamaterial temperature.
Article
Physics, Applied
M. Nazari, Y. Zhao, Z. Y. Fan, K. Ziemer, A. A. Bernussi, M. Holtz
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2015)
Article
Physics, Applied
M. Nazari, Y. Zhao, V. Hallum, A. A. Bernussi, Z. Y. Fan, M. Holtz
APPLIED PHYSICS LETTERS
(2013)
Article
Physics, Applied
Yong Zhao, Gulten Karaoglan-Bebek, Xuan Pan, Mark Holtz, Ayrton A. Bernussi, Zhaoyang Fan
APPLIED PHYSICS LETTERS
(2014)
Article
Chemistry, Multidisciplinary
Xuan Pan, Yong Zhao, Guofeng Ren, Zhaoyang Fan
CHEMICAL COMMUNICATIONS
(2013)
Article
Computer Science, Interdisciplinary Applications
Subash Vegesna, Mohammad Saed
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2013)
Article
Physics, Applied
Yong Zhao, Changhong Chen, Xuan Pan, Yanhan Zhu, Mark Holtz, Ayrton Bernussi, Zhaoyang Fan
JOURNAL OF APPLIED PHYSICS
(2013)
Article
Engineering, Electrical & Electronic
Subash Vegesna, Fahmida Irin, Micah Green, Mohammad Saed
JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS
(2013)
Article
Engineering, Electrical & Electronic
Subash Vegesna, Yanhan Zhu, Yong Zhao, Zhaoyang Fan, Ayrton Bernussi, Mohammad Saed
JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS
(2014)
Article
Engineering, Electrical & Electronic
Subash Vegesna, Mohammad Saed
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2012)
Article
Materials Science, Multidisciplinary
M. Nazari, Y. Zhao, V. V. Kuryatkov, Z. Y. Fan, A. A. Bernussi, M. Holtz
Article
Engineering, Electrical & Electronic
Milinda Pattanayak, Md Nadim F. Hoque, Yong Zhao, Zhaoyang Fan, Ayrton A. Bernussi
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2019)
Proceedings Paper
Telecommunications
Subash Vegesna, Mohammad Saed
2013 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI)
(2013)
