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
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
Engineering, Electrical & Electronic
Yulin Feng, Shaojun Fang, Shouli Jia, Zhixia Xu
Summary: This paper presents tri-layer stacked substrate integrated waveguide (SIW) bandpass filters (BPFs) using non-resonant nodes based on single-and dual-mode cavities. By carefully designed coupling topology, SIW BPFs with flexible finite transmission zeros (FTZs) can be realized. Additional FTZs can be obtained by exciting non-resonant nodes by changing the position of slots.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2022)
Review
Chemistry, Multidisciplinary
Mikhail Tarasov, Aleksandra Gunbina, Artem Chekushkin, Vyacheslav Vdovin, Aleksei Kalaboukhov
Summary: Integrated quasi-optical cryogenic terahertz receivers consist of various components such as detectors, filters, interferometers, and metamaterials, which were fabricated and experimentally studied on the same platform. These components were designed using different numerical simulation methods, with filters utilizing periodic frequency-selective surfaces and detector arrays requiring a complete analysis of the finite structure. The spectral characteristics of the filters, interferometers, and antenna arrays were measured in the frequency range of 50-600 GHz.
APPLIED SCIENCES-BASEL
(2021)
Article
Optics
Kasumi Miyata, Lisa Toyoshima, Kodai Iijima, Yuka Goto, Yoshinori Shohmitsu, Yoshinori Wada, Toshihiro Nakaoka
Summary: We developed a rigid bandpass filter with a broad far-infrared wavelength range and high transmission using a silicon subwavelength structure and Babinet complementary metamaterial half-mirror pair. The filter was produced through a simple process of photolithography, dry etching, and deposition, each performed once. The transmission principle is based on Fabry-Perot resonance with a metamaterial half-mirror pair that exhibits extraordinary optical transmission due to spoof surface plasmon polaritons. The subwavelength Si structure between the metamaterial mirrors enhances the filter characteristics by providing a narrower bandwidth and lower minimum transmittance than predicted by the basic equation.
Article
Optics
Xiaocan Xu, Ruijia Xu, Yu-Sheng Lin
Summary: The research proposes a design of tunable double split-ring metamaterial in the terahertz frequency range, demonstrating switchable characteristics between single-resonance and dual-resonance with polarization sensitivity, within the frequency range of 0.16 THz to 0.21 THz. Tunability and stability of DSRM can be achieved by changing the gap between two SRRs or the distance between face-to-face SRRs.
OPTICS AND LASER TECHNOLOGY
(2021)
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
Optics
Omar Khatib, Talmage Tyler, Willie J. Padilla, Nan M. Jokerst, Henry O. Everitt
Summary: This study demonstrates a simple imaging technique using a passive terahertz metamaterial with tailored polarization to map local strains in composite structures without the need for a reference spectral map. Only two orthogonal polarizations and a few frequencies are required to measure the strong terahertz response, allowing rapid and quantitative mapping of local strain environments over large areas.
Article
Optics
Fei Cai, Zhifei Kou
Summary: In this work, a MoS2 and graphene stacked structure is proposed as metamaterials for a triple-band terahertz absorber. The absorber consists of a complementary frequency-selective surface with three absorptions at 0.6 THz (99.7%), 1.5 THz (95.4%), and 2.5 THz (99.5%), achieved by two crossed linear slots and four pairs of concentric circular slots. The polarization of the absorber shows less sensitivity to the incident angle within a certain range, and the peak absorption frequency can be tuned by controlling the material properties of MoS2 and graphene. This stacked structure offers new possibilities for the design of THz absorbers, which are crucial for THz detection, communication, and imaging applications.
Article
Optics
Min Zhang, Danni Hao, Shuai Wang, Rui Li, Shou Wang, Yanqing Ma, Ramiro Moro, Lei Ma
Summary: This paper reports a subwavelength chiral metamaterial structure with tunable geometries and compositions for chiral biochemical sample detection. The chiroptical response of the metamaterial can be adjusted by manipulating the number of stacking layers and the twisted angle of the periodic unit. Experimental and numerical analysis reveal that the chiroptical response originates from the optical resonances of the gold disks and the adjacent array layers. The chiral metamaterial can achieve label-free detection of proline in biological samples and enantio-discrimination of chiral molecules, and the transmission circular dichroism (TCD) intensity can be regulated by the analyte concentration.
Article
Automation & Control Systems
Rui-Sen Chen, Sai-Wai Wong, Jing-Yu Lin, Yang Yang, Yin Li, Long Zhang, Yejun He, Lei Zhu
Summary: A novel method is proposed for developing a reconfigurable cavity bandpass filter using fluid dielectric, allowing controlled and reversible permittivity adjustments by varying the amount of water in the tube. By investigating triple-mode resonators with orthogonal electric fields, reconfigurable single-band and tri-band filters are achieved, offering easier and faster tuning compared to solid dielectric materials. The concept is validated by fabricating and measuring a reconfigurable tri-band filter for the first time.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Chemistry, Analytical
Yanfei Liu, Yu Chen, Jing Li, Chunli Zhang, Qiannan Wu, Ningning Su, Mengwei Li
Summary: In this article, a terahertz metamaterial biaxial strain pressure sensor structure is proposed to address the limitations of existing terahertz pressure sensors in terms of sensitivity, measurement range, and detection orientation. Through substrate material optimization and top cell structure improvement, a size-optimized structure is determined to improve both the range and sensitivity of pressure measurements. Simulation results show that the proposed sensor has a pressure-sensing effect in the 1.0-2.2 THz frequency range for both TE and TM polarization, with a sensitivity of up to 346 GHz/μm. This metamaterial pressure sensor has significant applications in remote monitoring of target structure deformation.
Article
Engineering, Electrical & Electronic
Weijian Cai, Jianfang Zhu, Youpeng Yang, Xiaoran Wang, Zhengfang Qian, Shuting Fan
Summary: In this study, a double-open hexagonal ring metamaterial (MM) with high refractive index sensitivity was designed and fabricated to improve the detection sensitivity of terahertz (THz) biosensors. The resonant properties of the MMs were demonstrated through simulations and experiments. The MM sensor showed high sensitivity and low detection limits to glucose and bovine serum protein (BSA) solutions, indicating potential applications in the THz biomedical field.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Haozhe Ma, Zhihui Hu, Daquan Yu
Summary: A third-order low insertion loss bandpass filter (BPF) is proposed using a stacked double-layer structure through the technologies of the glass-based integrated passive device (IPD) and the through glass vias (TGVs). The design involves a stacked multi-layer structure to create a high-Q 3D-inductor and an air cavity Metal Insulator-Metal (MIM) structure to improve the Q factor of the capacitor. Experimental results demonstrate that the proposed BPF achieves smaller size and lower insertion loss compared to existing designs.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Eistiak Ahamed, Md Mehedi Hasan, Mohammad Rashed Iqbal Faruque, Mohammad Tariqul Islam
Summary: This paper investigates metamaterial array architectures for power splitting and division in Terahertz technology, proposing new designs from rectangular array to cavity array to improve DNG response and splitting performance. The effective parameters of the devices show promising results for applications in microwave circuits.
RESULTS IN PHYSICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Subash Vegesna, Mohammad Saed
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(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
Optics
Yanhan Zhu, Subash Vegesna, Yong Zhao, Vladimir Kuryatkov, Mark Holtz, Zhaoyang Fan, Mohammad Saed, Ayrton A. Bernussi
Article
Engineering, Electrical & Electronic
Subash Vegesna, Yanhan Zhu, Ayrton Bernussi, Mohammad Saed
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2012)
Proceedings Paper
Telecommunications
Subash Vegesna, Mohammad Saed
2013 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI)
(2013)
