Article
Multidisciplinary Sciences
Yali Zeng, Qilin Duan, Jinying Xu, Zhilin Yang, Huanyang Chen, Yineng Liu
Summary: This study proposes a single-layer twisted graphene-patterned metasurface with tilted elliptical hole arrays and theoretically reveals its tunable circular conversion dichroism (CCD) in the terahertz (THz) region. The unit cell of the metasurface is achiral, and by changing the in-plane orientation of holes for structural 2D chirality, a tunable CCD can be achieved at normal incidence. The reflection phase can be considered as an intuitive method to show the metasurface's anisotropy, and active CCD can be achieved based on the tunability of graphene.
Article
Optics
Jingchen Li, Kun Zhang, Fan Yang, Siyang Yu, Xi Zhang, Si Sun, Qingrong Chen, Wei Yan
Summary: This paper proposes a dual-band shared-aperture asynchronous zoom optical system using focus tunable lenses, and designs a sub-system simultaneous iterative optimization algorithm to calculate the initial structure parameters. The designed optical system can work in both VIS and NIR bands with good performance.
Article
Computer Science, Information Systems
Young-Ho Cho, Cheolsoo Park, Sang-Won Yun
Summary: The study proposes a switchable dual/single-band tunable bandpass filter using a single J-inverter, achieving high stopband attenuation and potential for wideband cognitive radio applications.
Article
Materials Science, Multidisciplinary
Yongqiang Kang, Jianguo Zhang, Hongmei Liu, Yun He, Jing Zhang
Summary: A tunable dual-band metamaterial absorber consisting of a gold square ring and a metal film separated by a strontium titanate dielectric was investigated. Two resonance peaks with over 99% absorbance were achieved at room temperature. The proposed absorber can be easily manufactured and extended to other frequencies for various applications.
RESULTS IN PHYSICS
(2021)
Article
Multidisciplinary Sciences
Aniket Pal, Metin Sitti
Summary: Mechanical instabilities, such as bistable and multistable mechanisms, have attracted attention for enhancing the capabilities of soft robots and structures. This study proposes a simple approach to overcome the limitations of bistable mechanisms by dispersing magnetically active microparticles and using an external magnetic field to control their responses. The predictable and deterministic control of bistable elements under varying magnetic fields is experimentally demonstrated and numerically verified. This strategy enables precise control of transition waves in multistable lattices and the implementation of active elements for mechanical signal processing.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Engineering, Electrical & Electronic
Xuanfeng Tong, Zhi Hao Jiang, Yuan Li, Fan Wu, Ronan Sauleau, Wei Hong
Summary: This paper presents the design and experiments of a dual-wideband dual-circularly polarized shared-aperture reflectarray, operating at the K-/Ka-band using a single functional substrate. Wideband performance is achieved by coupling the adjacent resonances of the aperture and patch and utilizing shorted microstrip phase delay lines. The reflectarray cells can independently control the reflective phase delay of orthogonal CP beams at both frequency bands, providing four degrees of freedom for beamforming. The wideband performance of the proposed cells is verified through the investigation of an infinite periodic gradient array.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Physics, Multidisciplinary
Songsong Li, Yangyang Fu, Lei Gao, Jian-Hua Jiang, Yadong Xu
Summary: In this study, the concept of phase gradient metasurfaces is demonstrated to be a versatile approach for controlling light diffraction through small holes or slits. A single subwavelength metallic slit surrounded by air grooves of gradient depth is considered as an example. The phase gradient enables unidirectional excitation of surface plasmons, resulting in extraordinary optical transmission. Unidirectional radiation of an optical dipole inside the slit can be achieved by applying different phase gradients to both sides of the metal plate.
NEW JOURNAL OF PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Miguel Ferrando-Rocher, Jose Herranz-Herruzo, Alejandro Valero-Nogueira, Mariano Baquero-Escudero
Summary: This letter introduces a 4 x 4 single-layer dual-band array antenna operating in the K- and Ka-band using gap waveguide (GW) technology, featuring a dual-frequency operation, corporate-feed network, and a diplexer for band separation. Experimental results demonstrate impedance and radiation pattern bandwidths larger than 2 GHz in both bands.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
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
Multidisciplinary Sciences
Davod Nobahar, Sirous Khorram, Joao D. Rodrigues
Summary: This study focuses on the transmission of vortex beams through an adjustable magnetized plasma-ferrite structure with negative refraction index, using angular spectral expansion technique and 4x4 matrix method. Numerical analysis reveals high transparency and significant Faraday rotation near resonance frequency region, as well as reverse rotation of spiral wave front. These controllable properties of the proposed structure offer novel facilities for manipulating intensity and phase profiles of vortex radiation during transmission.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Electrical & Electronic
Ai Hu Song, Yu Jian Cheng
Summary: In this article, a dual-polarized Ku-band and single-polarized Ka-band shared-aperture phased array antenna design is proposed. The design effectively solves the shading effect and scanning blind spots of the Ku-band antenna, and achieves a beam-scanning coverage of +/- 50 degrees.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Chemistry, Multidisciplinary
Suyeon Kim, Junhyung Jeong, Girdhari Chaudhary, Yongchae Jeong
Summary: This paper presents a design for a dual-band tunable phase shifter with independently controllable phase shifting between each operating frequency band. The proposed phase shifter achieves a wide phase shifting range at each operating frequency by compensating for the susceptance occurring at the co-operating frequency band. The design was successfully fabricated and tested, demonstrating satisfactory performance.
APPLIED SCIENCES-BASEL
(2022)
Article
Acoustics
Graham C. Collins, Timothy A. Brumfiel, Zachary L. Bercu, Jaydev P. Desai, Brooks D. Lindsey
Summary: Peripheral artery disease affects a large number of people, and a newly developed device can provide minimally invasive procedures, solve the problem of guidewire advancement, improve imaging quality, and ultimately improve patient outcomes.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2022)
Article
Physics, Applied
Yinghui Ren, Xiaogang Wang, Chijie Xiao
Summary: This research analyzes the field enhancement properties of a subwavelength metallic groove and finds that the field enhancement varies periodically with groove depth. Additionally, rounding the sharp vertices at the inlet of the groove and the incident angle also affect the field enhancement.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Optics
Haifeng Mao, Xianshan Dong, Yihui Liu, Dilusha Silva, Lorenzo Faraone
Summary: This paper reports the first demonstration of a cryogenic mid-wave infrared (MWIR) hyperspectral fixed-cavity Fabry-Perot filter based on a suspended tensile-strained single-layer 2-D subwavelength grating (SWG) mirror. The performance optimization and parameter tolerance study of the 2-D SWG mirror are conducted. The fabricated suspended SWG mirror shows excellent surface flatness and high reflectivity for MWIR photodetection at 80 K, providing a wide fractional bandwidth and high spectral resolution.
Article
Nanoscience & Nanotechnology
Jinqing Cao, Huiming Yao, Yachen Pang, Jianchun Xu, Chuwen Lan, Ming Lei, Ke Bi
Summary: This study demonstrates a compact dual-band mechanical antenna for enhancing electromagnetic radiation. The mechanical antenna, consisting of piezoelectric ceramic rings, has been experimentally shown to have radiation enhancement within the VLF range. It has great potential for applications in portable, low-cost, and high-performance VLF wireless communication devices.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Jing Qin, Yu Zhao, Shaojie Luo, Chuwen Lan, Haihong Li, Ke Bi, Yanan Hao
Summary: This study compared and characterized several flexible electrodes for capacitive sensors. Carbon nanotubes were found to be the most promising electrode due to their excellent electrical and mechanical properties.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Physics, Multidisciplinary
Yang Yang, Hsun-Chi Chan, Ke Bi, Gaoyan Duan, Maoxin Liu, Haoyi Wang, Liangsheng Li
Summary: This study applies photonic Weyl metamaterials to optical tweezers and investigates the optical force generated by the body state of the metamaterials. The results show that for oblique incidence, the optical force spectra exhibit a valley around the Weyl frequency with zero magnitude, and the forces exhibit strong optical circular dichroism. Additionally, the transmissions through the metamaterials demonstrate significant linear-to-circular polarization conversion and induce abnormal force on chiral particles.
NEW JOURNAL OF PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Qingxiang Wu, Zunpeng Feng, Ziming Cai, Chuwen Lan, Jianchun Xu, Ke Bi, Yanan Hao
Summary: To improve the energy storage density of capacitors, the ferroelectric phase poly(vinylidene fluoride) (PVDF) is introduced as a modifier. Blending PVDF-doped PMMA composites enhances the polarization strength but sacrifices the breakdown strength due to the presence of defects. To address this issue, a double-layer structure is designed with controlled interfacial bonding achieved through hot pressing. This work successfully achieves high discharge energy density and maintains energy efficiency in PMMA and PVDF composite films.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Chen-Bo-Wen Li, Hao-Cheng Thong, Yi-Xuan Liu, Ke Bi, Zhengqian Fu, Ke Wang
Summary: This study systematically investigates the hardening effect in ferroelectric materials and reveals its association with the nanoscale domain reconfiguration and the ferroelectric-paraelectric phase transition temperature. It offers new insights into improving the performance of high-power piezoelectric applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Zhaozhen Wang, Zunpeng Feng, Hongsong Tang, Junhao Wang, Ziming Cai, Ke Bi, Yanan Hao
Summary: This study theoretically analyzes the effects of orientation angles and aspect ratios of nanofiber fillers on the breakdown behavior and dielectric properties of composites. The results show that a higher inclination of the nanofiber fillers leads to a higher nominal breakdown strength, due to obstruction of conductive channels. However, the dielectric constant shows an opposite trend. Additionally, a higher aspect ratio of the nanofiber fillers helps achieve a higher breakdown strength with a slight sacrifice of the dielectric constant.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Jianchun Xu, Zhao Li, Xuchao Pan, Xi Wen, Jinqing Cao, Wen Gong, Shaolong Yang, Ming Lei, Fangzhou Yao, Ke Bi
Summary: Mechanical antennas based on piezoelectric materials can significantly reduce the size of long wave antennas and improve communication capacity. However, their narrow bandwidth and weak field intensity limit their practical applications. A mechanical antenna based on PMN-PT is proposed to address these limitations and exhibits ultra-wideband characteristics and excellent communication properties.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Materials Science, Ceramics
Chen-Bo-Wen Li, Zhao Li, Juan Wang, Yi-Xuan Liu, Jing-Tong Lu, Ze Xu, Pak-Sheng Soon, Ke Bi, Chuan Chen, Ke Wang
Summary: With the development of perovskite-piezoelectric-ceramic-based studies, piezoelectric materials have undergone a revolution in the past 70 years, allowing for the conversion between electrical and mechanical energy. Lead zirconate titanate has dominated the market of piezoelectric ceramics for many years, but the demand for environmental-friendly and lead-free alternatives has led to the emergence of (Li,Na)NbO3 (LNN) materials. This review explores the progress in the development of LNN materials, including their crystal structures, phase transitions, and local structural distortions, as well as the engineering approaches used to enhance their functional performance. The exceptional performance of LNN ceramics at high vibration velocities makes them promising for high-power applications.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Chemistry, Physical
Nan Feng, Jian Han, Changpeng Lin, Zhengwei Al, Chuwen Lan, Ke Bi, Yuanhua Lin, Kan-Hao Xue, Ben Xu
Summary: The Jahn-Teller effect and anti-Jahn-Teller effect are symmetry-breaking phenomena caused by ions in crystal structures. In this study, the anti-Jahn-Teller effect was successfully induced by THz laser illumination in BaBiO3 material, and an insulator-to-metal transition on the picosecond timescale was observed.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Yufeng Wu, Jianbo Wu, Yan Lin, Junchen Liu, Xiaolong Pan, Xian He, Ke Bi, Ming Lei
Summary: In this paper, a low-cost and high-efficiency sensor component preparation method is proposed. The sensor component TTMS is constructed using a melamine sponge as a flexible substrate and metallizing it with TTF-TCNQ organic conducting molecule to create a conductive pathway. The experimental results show that the sensor has good mechanical and electrical stability, and can distinguish small pressure changes and respond quickly to pressure application and release. The excellent performance of the sensor is expected to promote its commercial application.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Huiming Yao, Jiapeng Yang, Han Li, Jianchun Xu, Ke Bi
Summary: With the increasing electromagnetic pollution, there is an urgent need for multilayer radar absorbing materials that are lightweight, have strong absorption capabilities, and a wide absorption bandwidth. However, the current design methods that use simulation operations or optimization strategies alone are not comprehensive. In this study, a simulation-optimization approach is proposed that combines electromagnetic simulation and numerical calculation, and introduces the homogeneous medium substitution method to simplify complex structures. The study also investigates the return loss and impedance matching of different layer structures. The simulation results show that structures with better impedance matching have superior absorbing performance. The proposed optimal method demonstrates fast and efficient advantages, and holds tremendous potential for various applications such as military stealth and electromagnetic wave elimination.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Junchen Liu, Kangze Liu, Xiaolong Pan, Ke Bi, Feng Zhou, Pengfei Lu, Ming Lei
Summary: Electrocardiogram (ECG) can be used by doctors to diagnose various cardiovascular diseases. To ensure continuous collection of high-quality ECG signals for a long time, low impedance and long-term stability are crucial for ECG electrodes. This study developed ECG semidry electrodes with low impedance and high stability by coating silver nanowires on poly (vinyl alcohol) (PVA) hydrogel. The PVA hydrogel continuously releases electrolyte to decrease the impedance of the skin and minimize signal attenuation. These electrodes can acquire high-quality ECG signals (SNR > 30) continuously for 24 hours, even during movement. They can be mass-produced at a low cost, making them promising for applications requiring precise long-term ECG monitoring.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2023)
Article
Materials Science, Ceramics
Zhao Li, Chen-Bo-Wen Li, Hao-Cheng Thong, Yu-Qi Jiang, Jianchun Xu, Yanan Hao, Chao-Feng Wu, Zhongshang Dou, Ke Bi, Ke Wang
Summary: Lead zirconate titanate (PZT)-based piezoelectric ceramics with increasing average grain size were prepared and their properties were systematically investigated. The results showed that the electromechanical properties of the ceramics improved significantly with increasing grain size. In addition, the formation of non-180 degrees domain walls was suppressed in the fine-grain samples, while enhanced domain wall mobility was observed in the coarse-grain samples. This study confirmed that grain size engineering is an effective strategy for designing piezoelectric materials with excellent combination properties.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Zun-Peng Feng, Ya-Nan Hao, Jing Qin, Shao-Long Zhong, Ke Bi, Yu Zhao, Li-Juan Yin, Jia-Yao Pei, Zhi-Min Dang
Summary: Large deformability and high sensitivity are achieved simultaneously in a high-performance soft stretchable sensor by incorporating ultrasmall barium titanate nanoparticles (BT NPs) with high permittivity and highly active surfaces and a high-stretchability p(BA-GMA) elastomer matrix. The sensor exhibits high capacitance and sensitivity due to the increased permittivity and capacitance of the composite dielectric material. The BT/p(BA-GMA)-based sensor has excellent stability and reliability, making it suitable for dynamic monitoring applications.
Article
Materials Science, Multidisciplinary
Nan Feng, Jian Han, Chuwen Lan, Ben Xu, Ke Bi, Yuanhua Lin, Cewen Nan
Summary: This paper presents a methodology to evaluate the possibility of picosecond multiple switching of order parameters in perovskite structure oxides using first-principles calculations. With the model system of multiferroic BiFeO3, the authors demonstrate that desired properties can be tuned by an external laser pulse, enabling switching of polarization and magnetization within 1 ps. The switching mechanisms can be attributed to the nonlinear coupling of infrared-active mode with ferroelectric and antiferrodistortive modes.
