Article
Physics, Applied
Rowan S. Parker-Jervis, Sae June Park, John E. Cunningham
Summary: Finite-element methods were used to design and simulate a tunable terahertz band-stop filter based on coupled split-ring resonators integrated into a planar Goubau-line waveguide. Two split-ring resonators with different geometrical lengths and gap widths were designed to resonate at the same frequency, with controlled resonance splitting by adjusting the distance between them. Investigation of the coupling strength of the resonators as a function of relative separation revealed a dispersion relation showing anti-crossing of the coupled resonances as the cantilever bends.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Yifei Xu, Qi Song, Enen Li, Min Zhang, Zhenhua Sun, Tianwu Wang, Fang Liu, Peiguang Yan
Summary: An optical controlled THz modulator is proposed in this study, combining lead sulfide (PbS) quantum dots with subwavelength metallic split-ring resonators (SRRs) to provide field enhancement. The modulation depth reaches 60.3%, which is approximately 3 times larger than the PbS quantum dots film without SRRs (as reference) in the frequency range of 0.1-1.1 THz. The significant enhanced THz modulation is mainly attributed to the local THz field enhancement caused by the SRRs, consistent with the simulation result.
Article
Computer Science, Information Systems
Henry Fabian-Gongora, Alexander E. Martynyuk, Jorge Rodriguez-Cuevas, Lourdes Martinez-Lopez, Rosalba Martinez-Lopez, Jose I. Martinez-Lopez
Summary: This paper presents a tunable triband frequency selective surface unit cell based on varactor-loaded split ring slots, achieving close band response and independent band tuning by adjusting the capacitance. The simulated and measured results demonstrate successful frequency tuning and close band response with insertion loss improvements when using biasing diodes.
Article
Nanoscience & Nanotechnology
Baiying Taishi, Yating Yang, Xueqi Wu, Jianchun Xu, Shanguo Huang
Summary: This article presents, optimizes, and measures a novel 3D electrically small antenna with dual-band. The optimized antenna works in 0.789 GHz and 1.183 GHz, showing simulated results similar to measured results, meeting the miniaturization requirements of modern wireless communication systems.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Optics
Jie Xu, Jian Tang, Ming Chen, Chuanxin Teng, Shijie Deng, Yu Cheng, Shiliang Qu, Libo Yuan
Summary: This study proposes improved linear and circular dichroic metamirrors based on single-layer graphene to address the issues of low efficiency, single function, and complex structure in existing dichroic metamirrors. The designed metamirrors consist of the ion-gel, patterned graphene, polyimide, polysilicon, and gold substrates. The anisotropy of the achiral structures enables simultaneous circular dichroism (0.8) and linear dichroism (0.9) in two directions without functional switching. The exceptionally strong dichroism is achieved by manipulating the incidence angle of electromagnetic waves rather than the structural chirality.
Article
Optics
Giuseppe Brunetti, Nicola Sasanelli, Mario N. Armenise, Caterina Ciminelli
Summary: Silicon photonics technology is the most mature technology to implement quantum system functionalities, and the design of filters can achieve efficient detection of high-performance photon-pair sources.
OPTICS AND LASER TECHNOLOGY
(2021)
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)
Article
Chemistry, Analytical
Junchao Zhou, Diana Al Husseini, Junyan Li, Zhihai Lin, Svetlana Sukhishvili, Gerard L. Cote, Ricardo Gutierrez-Osuna, Pao Tai Lin
Summary: Chip-scale infrared spectrometers consisting of a microring resonator array were developed for volatile organic compound detection. The spectrometers can perform multiwavelength mid-infrared sensing, enabling high specificity and compact design.
ANALYTICAL CHEMISTRY
(2022)
Article
Engineering, Electrical & Electronic
Swadesh Poddar, Alexander M. Holmes, George W. Hanson
Summary: In this study, a tunable magnet-free, non-reciprocal metamaterial is developed and experimentally tested. The non-reciprocity is introduced by connecting the split-ring gap with a biased field-effect transistor (FET), which allows the non-reciprocity to be adjusted based on the bias conditions. Faraday rotation is used as a measure of non-reciprocity, and a linear relationship between Faraday rotation and drain-source current at the resonance is observed.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Chemistry, Physical
Jinfeng Dong, Yilin Jiang, Jiawei Liu, Jun Pei, Xian Yi Tan, Haihua Hu, Ady Suwardi, Ning Jia, Chuntai Liu, Qiang Zhu, Qingyu Yan, Jing-Feng Li
Summary: In this study, composition-insensitive GeTe-based compounds with high thermoelectric coefficients and excellent module performance were developed, suitable for waste heat recovery and solid-state cooling applications.
Article
Engineering, Electrical & Electronic
Ali M. Albishi, Saleh A. Alshebeili, Omar M. Ramahi
Summary: This paper presents a sensitive microwave near-field sensor based on utilizing a three-dimensional capacitor within a planar split-ring resonator, which enhances sensitivity in detecting dielectric fluids. Experimental testing shows higher sensitivity in detecting the presence of chloroform and dichloromethane, as well as changes in fluid levels. The proposed sensor offers improved performance compared to planar resonators, with increased electric field enhancement and higher loaded-quality factor achievable.
IEEE SENSORS JOURNAL
(2021)
Article
Instruments & Instrumentation
Sachin Seth, Apala Banerjee, Nilesh K. Tiwari, M. Jaleel Akhtar
Summary: A tunable automated standalone RF sensor system based on ANN is proposed, achieving a higher tuning range with a modified design configuration. The ANN is trained using S-parameters of various dielectric samples as a training dataset, providing reasonably accurate results for the extracted complex permittivity.
REVIEW OF SCIENTIFIC INSTRUMENTS
(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
Materials Science, Multidisciplinary
Ilya A. A. Eliseyev, Bogdan R. R. Borodin, Dmitrii R. R. Kazanov, Alexander V. V. Poshakinskiy, Maja Remskar, Sergey I. I. Pavlov, Lyubov V. V. Kotova, Prokhor A. A. Alekseev, Alexey V. V. Platonov, Valery Yu. Davydov, Tatiana V. V. Shubina
Summary: Synthesized micro- and nanotubes composed of TMDCs like MoS2 show potential for applications in nanophotonics due to their strong exciton luminescence and ability to act as whispering gallery microcavities at room temperature. The study focuses on a class of twisted tubes with a flattened cross-section that rotates along the tube axis. The results show the possibility of creating multifunctional tubular TMDC nanodevices that can amplify self-emitting light at adjustable frequencies.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Hao-Ran Ma, Tian-ting Chen, Le Liu, Jia-ji Yang, Ya-qing Qiao, Shao-rui Yang, Yi Liu, Jun Duan, Wei Xiong, Lei-min Deng
Summary: This article proposes a novel metasurface design based on GeTe film, which achieves low reflection characteristics in different frequency bands by controlling the state of GeTe. It has excellent dual geometric phase independent modulation ability and can be a good candidate for military stealth materials.
ADVANCED OPTICAL MATERIALS
(2023)