Article
Engineering, Electrical & Electronic
Zhijun Qiao, Xuchao Pan, Fan Zhang, Jianchun Xu
Summary: A tunable dual-band metamaterial filter based on crossed split-ring resonators is demonstrated through numerical and experimental methods. The filter consists of two metal split rings with different angles, generating two stopbands through cross-coupling. The operating frequency of the stopbands can be tuned by changing the angle between the split rings. The results confirm the tunable characteristics of the proposed metamaterial filter.
IEEE PHOTONICS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Jiwei Li, Yue Hu, Xufan Gan, Feng Gao, Wending Zhang, Ligang Huang, Fang Bo, Guoquan Zhang, Jingjun Xu
Summary: The study presented a tunable bandwidth add-drop filter in the ideal quasicritical coupling state, demonstrating stable efficiency, narrow bandwidth, and a wide tuning range in the experiment. The filter has potential applications in microwave photonics, narrow linewidth lasers, and nonlinear optics.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Hao Li, Junlin Wang, Xin Wang, Yao Feng, Zhanshuo Sun
Summary: In this article, we propose and design a metamaterial broadband stop-band filter with a steep cut-off in the terahertz region. The filter is based on the flexible structure of metal-dielectric-metal-dielectric-metal (MDMDM). It has excellent characteristics and wide potential applications.
Article
Engineering, Electrical & Electronic
Xiongying Chao, Yunfan Wang, Feng Huang, Zhaoyang Chen
Summary: A new design for an ultra-thin broadband stop-band metamaterial filter in the terahertz region is proposed. The metal-dielectric-metal structure is studied using simulations with CST software. The results show that the filter has a -20 dB bandwidth of 1.1 THz and a transmission rate in the stopband not exceeding 1%. The filter's filtering mechanism is understood by analyzing the field intensity and surface current distribution. The designed filter is thinner, has better performance, and is potentially applicable in terahertz communication and electromagnetic shielding.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Mathematics, Interdisciplinary Applications
Ludovico Minati, Boyan Li, Jim Bartels, Zixuan Li, Mattia Frasca, Hiroyuki Ito
Summary: This study investigates the dynamics of chaotic systems with band-pass filtering coupling. Phase synchronization remains detectable down to a fractional bandwidth of approximately 5% when the pass band is centered around the predominant spectral peaks. Consistent results are obtained through numerical simulations and experimental measurements. Selective locking can be achieved on a shared channel, and the chaotic dynamics are influenced in one aspect without significantly impacting other aspects.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Physics, Multidisciplinary
K. A. Karthigeyan, S. Radha, E. Manikandan
Summary: This paper presents the design and analysis of a tri-band metamaterial band-stop filter for terahertz applications. The designed structure consists of a gold metallic patch on a flexible polyimide substrate, with resonances at 0.6 THz, 1.4 THz, and 2.4 THz. The proposed structure exhibits polarization-insensitive and angle-resolved transmission characteristics, making it suitable for broadband terahertz applications.
PRAMANA-JOURNAL OF PHYSICS
(2022)
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
Materials Science, Multidisciplinary
Sare Nur Cuhadar, Habibe Durmaz
Summary: In this article, a metamaterial multi-band perfect absorber with a Pi-inverted-Pi resonator is designed and analyzed. The results show that this structure exhibits nearly perfect absorption in five narrow bands. The tunability of the resonator and the origin of these resonance bands are investigated. Additionally, the polarization dependence of the structure is examined, and it is found to be partially polarization-dependent, which is beneficial for optical filtering. Compared to similar absorbers in the literature, the proposed system offers narrow bands with high Q-factors at each resonance wavelength.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Mechanics
Qida Lin, Jiaxi Zhou, Kai Wang, Daolin Xu, Guilin Wen, Qiang Wang
Summary: This paper introduces a new class of three-dimensional locally resonant (LR) metamaterials with quasi-zero stiffness (QZS) property. The monolithic QZS property is achieved by optimizing the three-dimensional resonator. The characteristics of wave propagation in the proposed 3D QZS metamaterial are investigated and a lumped-mass-spring model is developed to derive the dispersion relation. The study reveals the formation mechanism of low-frequency complete band gap and suggests a feasible approach for opening a low-frequency and wide complete band gap.
COMPOSITE STRUCTURES
(2023)
Article
Mathematics
Naim Ben Ali, Serhan Alshammari, Youssef Trabelsi, Haitham Alsaif, Omar Kahouli, Zied Elleuch
Summary: This study numerically investigates the behavior of photonic quasi-periodic Generalized Fibonacci (GF) (m, n) sequences in the visible spectrum. The transfer matrix method is used to analyze the wave propagation through these structures. The research highlights the importance of GF structures by comparing their transmittance spectra with those of periodic and ordinary Fibonacci structures. It is found that GF structures allow for the presence of multiple photonic band gaps (PBGs) separated by resonance modes, and the number, position, and width of these gaps can be tuned by changing the parameter m. The proposed structures have potential applications as tunable multi-band-stop filters for optical fiber wavelengths.
Article
Engineering, Electrical & Electronic
Maoyu Fan, Kaijun Song, Li Yang, Roberto Gomez-Garcia
Summary: An approach to design RF all-port-reflectionless quasi-elliptic-type single-/dual-band bandpass filters and diplexers with frequency-adaptive constant-absolute-bandwidth response is reported. By utilizing a balanced-circuit scheme and tunable BPF units, low reflection behavior and frequency tuning capability are achieved.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Engineering, Electrical & Electronic
G. Challa Ram, P. Sambaiah, S. Yuvaraj, M. V. Kartikeyan
Summary: This paper presents the design and analysis of a spoof surface plasmon polaritons (SSPP)-based bandwidth tunable bandstop filter (BSF) operating at 0.26 THz frequency. The proposed filter is capable of offering tunable bandwidth at THz frequency using a variable capacitor. The experimental results demonstrate the potential use of the proposed terahertz filter as an ultra-compact BSF in future applications of photonic integrated circuits in terahertz imaging.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Article
Optics
Ibrahim Issah, Fangfang Li, Marian Baah, Isaac A. Otoo, Lewis Asilevi, Prince Bawuah, Benjamin O. Asamoah
Summary: In this study, a fan-like metamaterial absorber (FMMA) composed of an Au-TiO2-Au multilayer was numerically analyzed and experimentally verified. The design demonstrated high absorbance in the visible spectrum (>98%), attributed to the excitation of localized surface plasmons (LSPs) and propagating surface plasmons (PSPs). The introduction of a TiO2 dielectric spacer between the top fan-like nanopatterned structure and the bottom planar Au-film played a crucial role in enhancing absorbance and shifting the spectral response towards longer wavelengths. Furthermore, the FMMA exhibited polarization and angle insensitivity in the visible spectrum under different incident angles, showing potential for sensing applications and selective absorption devices.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Multidisciplinary Sciences
Okky Daulay, Gaojian Liu, Kaixuan Ye, Roel Botter, Yvan Klaver, Qinggui Tan, Hongxi Yu, Marcel Hoekman, Edwin Klein, Chris Roeloffzen, Yang Liu, David Marpaung
Summary: The authors demonstrate programmable integrated microwave photonic filters with low noise figure and ultrahigh dynamic range, using a combination of modulation transformer and double injection ring resonator in a single photonic chip.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Anil Rajput, Biswajeet Mukherjee
Summary: An electronically tunable Ultra-Wideband (UWB) Band Stop Filter (BSF) is investigated in this study, utilizing a varactor diode for tuning purposes. The filter employs open stubs and Step Impedance Resonator (SIR) topology to achieve the desired UWB bandstop response. The proposed miniaturized BSF demonstrates excellent agreement between the simulated electromagnetic model and the measured results of the fabricated prototype, achieving a very high skirt factor (SF) of 380 dB/GHz.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
