Article
Chemistry, Multidisciplinary
Kai Sun, Chong Wang, Jiahong Tian, Zheng Zhang, Ni Zeng, Rui Yin, Wenxin Duan, Qing Hou, Yaman Zhao, Haikun Wu, Runhua Fan
Summary: Magnetic-driven broadband ENZ materials, achieved by fabricating PVA/Ni@CNTs films, exhibit unique physical characteristics and show great potentials in various applications. The film also demonstrates excellent magnetic actuation ability under a magnetic field, expanding its applications to novel fields.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jiahong Tian, Runhua Fan, Zheng Zhang, Yang Li, Haikun Wu, Pengtao Yang, Peitao Xie, Wenxin Duan, Chun-Sing Lee
Summary: Epsilon-near-zero (ENZ) materials have unique physical properties and show great potentials in the fields of flexible electronics, wearable devices, and sensors. In this study, flexible and biocompatible poly (vinyl alcohol)/multi-walled carbon nanotubes (PVA/MWCNTs) hydrogels were used as ENZ materials at radio frequency for the first time. The hydrogels exhibited two different water states, and the ENZ phenomenon was observed when the MWCNTs content reached a certain percentage.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Zheng Zhang, Mingxiang Liu, Mohamed M. Ibrahim, Haikun Wu, Yan Wu, Yang Li, Gaber A. M. Mersal, Islam H. El Azab, Salah M. El-Bahy, Mina Huang, Yunxiao Jiang, Gemeng Liang, Peitao Xie, Chunzhao Liu
Summary: This work focuses on the fabrication and characterization of flexible polystyrene/graphene (PS/GR) composites with epsilon-near-zero (ENZ) properties at radio frequency. The addition of graphene nanosheets in PS matrix led to the formation of a continuous conductive network, resulting in the observation of ENZ behavior at around 920 kHz. This research demonstrates the potential of flexible PS/GR composites in applications such as invisibility cloaks, drug delivery, and soft robotics.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Materials Science, Composites
Zongxiang Wang, Kai Sun, Haikun Wu, Yunpeng Qu, Jiahong Tian, Licheng Ju, Runhua Fan
Summary: In the study of electromagnetic metamaterial, the lack of epsilon-near-zero (ENZ) response at radio frequency has restricted the application of novel antennas and printed circuit board. To explore this issue, ternary copper/silica coated copper/polyvinylidene fluoride (Cu/Cu@SiO2/PVDF) composites were prepared. The results showed a transition from positive to negative permittivity when increasing the content of Cu granules in the binary Cu/PVDF composites.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Aleksei Anopchenko, Sudip Gurung, Subhajit Bej, Ho Wai Howard Lee
Summary: Using electrodynamical description, an expression for the electric-field intensity enhancement (FIE) due to epsilon-near-zero (ENZ) polariton modes is presented. The study shows that FIE reaches a limit in ultrathin ENZ films, inversely proportional to ENZ losses. The research also predicts high values of FIE in ultrathin polar semiconductor films.
Article
Nanoscience & Nanotechnology
Haikun Wu, Zheng Zhang, Chong Wang, Khamael M. Abualnaja, Hala M. Abo-Dief, Qing Hou, Hassan Algadi, Rui Yin, Xiaodong Liu, Peitao Xie, Yao Liu
Summary: In this work, honeycomb-like superstructures consisting of silver nanoparticles and polystyrene matrix are constructed using the non-solvent induced phase separation self-assembly method for the first time. These structures exhibit positive permittivity response by surface plasmon resonance effect and plasma-type negative permittivity response, resulting in a broadband ENZ property in the radio-frequency range. The enhancement of positive permittivity due to the SPR effect plays a dominant role. The study provides a theoretical foundation and guidance for designing ENZ properties in biocompatible metal/dielectrics composites using the SPR effect.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2023)
Article
Chemistry, Physical
Zihao Guo, Zhihao Sun, Peng Wang, Benli Du, Lei Qian
Summary: This paper investigates the effect of diatomic doping on the negative permittivity and epsilon-near-zero (ENZ) properties of graphene/polyvinylidene difluoride (GR/PVDF) composites. Nitrogen (N) and phosphorus (P) atoms were doped into the GR lattice, and their doping sites and ratio were studied. The results show that the introduction of N and P atoms controls the percolation structure and carrier concentration, resulting in a stable weak negative permittivity and an ENZ response in the kHz region.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Chang Ding, Yudeng Wang, Junxiang Zhou, Huilin Mu, Yajuan Han, Fanyi Meng, Jiafu Wang
Summary: Liquid crystals with tunable dielectric properties in the microwave frequency band are of great significance for design of reconfigurable microwave devices. This article proposes a method for characterizing the dielectric properties of liquid crystals based on epsilon-near-zero metamaterials. The method involves designing a measurement device, integrating biased circuits and preconditioned alignments, and controlling the temperature of the liquid crystals. The effectiveness of the method is verified through experiments.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Chemistry, Physical
Ryan Bower, Matthew P. Wells, Freya Johnson, Rebecca Kilmurray, Brock Doiron, Eleonora Cali, Giuseppe Mallia, Bin Zou, Andrei P. Mihai, Nicholas M. Harrison, Sarah Fearn, Rupert Oulton, Neil McN. Alford, Lesley F. Cohen, Peter K. Petrov
Summary: This study investigates the optical response and electrical properties of reactively sputtered niobium oxynitride thin films through experimental and computational simulations. The experimental results show that these films have screened plasma wavelengths tunable over a range of 90 nm, and exhibit a double epsilon-near-zero behavior. This behavior is attributed to the incorporation of oxygen into the films during deposition.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Ceramics
Yunpeng Qu, Peitao Xie, Yunlei Zhou, Junfei Ding, Yanli Chen, Xiu Gong, Jingliang Yang, Qiong Peng, Xiaosi Qi
Summary: This study presents a composite material consisting of CaCu3Ti4O12 and graphitized-multiwall carbon nanotube designed based on electronic structure and percolation theory. The composite material exhibits a switchable response from positive to negative permittivity with increasing frequency and achieves tunable epsilon'-near-zero effect. The composite material shows excellent electromagnetic shielding performance at specific frequencies.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Applied
Hodjat Hajian, Ivan D. Rukhlenko, Veysel Ercaglar, George Hanson, Ekmel Ozbay
Summary: This study comprehensively analyzes the near-field radiative heat transfer between black phosphorous (BP) flakes and demonstrates that covering the BP flakes with hexagonal boron nitride (hBN) films significantly enhances the heat transfer. The heat transfer can be actively switched by changing the chemical potential of the BPs and can be modified by altering the number of BP layers. Additionally, replacing hBN with alpha-MoO3 modifies the spectral and intensity of the near-field radiative heat transfer.
APPLIED PHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Mohsen Azadi, George A. Popov, Zhipeng Lu, Andy G. Eskenazi, Avery Ji Won Bang, Matthew F. Campbell, Howard Hu, Igor Bargatin
Summary: The study reports a method of using suspended polymer films for long-duration near-space flight. By utilizing carbon nanotubes coated polyester films, a net recoil force generated by light driving allows for lightweight flight.
Article
Engineering, Aerospace
Damon Landau, Benjamin Donitz, Reza Karimi
Summary: Interstellar Objects (ISOs) provide a unique opportunity to investigate the nature of objects from outside our Solar System. Only two ISOs have been identified so far, and more are expected to be found with new observatories. Rendezvous missions that orbit or land on ISOs are necessary to gain ground truth about these objects, but mission design and propulsion capability pose challenges. However, a combination of Jupiter gravity assist and nuclear electric propulsion offers the best chance of reaching an ISO's orbit.
Article
Engineering, Electrical & Electronic
Hao Li, Ziheng Zhou, Yue Li
Summary: In this paper, a novel dual-polarized epsilon-near-zero (ENZ) antenna is proposed, with independent operating frequencies for both polarizations. The antenna design utilizes an antiphase ENZ mode based on a slot-fed substrate-integrated waveguide (SIW) antenna, which allows for fixed operating frequency independent of length. The proposed design enables independent tuning of SIW lengths for both polarizations while maintaining controllable radiation patterns. Two antenna prototypes were fabricated and tested, showing agreements between simulation and experiment. The proposed design method allows for the design of antennas with various radiation patterns at a fixed frequency, and also inspires the design of flexible antennas with unchanged operating frequency when folded.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Optics
Mina Vafaei, Mahmood Moradi, Gholam Hossein Bordbar
Summary: A highly sensitive refractive index sensor was designed using a MDM nanostructured thin film, achieving high sensitivity and tunability in the near-infrared region. Numerical simulations confirmed the MDM thin film as an ENZ metamaterial, with experimental results verifying its sensitivity and small footprint advantages. This sensor shows promise for future nanosensing applications such as plasmonic metamaterial sensors.
Article
Engineering, Electrical & Electronic
Xiaogang Jiang, Haoling Yang, Xuan Liu, Daru Chen, Sailing He
Summary: A novel chalcogenide As2Se3 fiber with a twin-tube structure is proposed and studied for mid-infrared single-polarization single-mode operation. The fiber exhibits excellent confinement properties and a wide wavelength range, making it suitable for MIR photonics and nonlinear fiber optics.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Chemistry, Physical
Hao Wu, Xiaoyu Cheng, Songjun Xie, Yan Huang, Raheel Ahmed Janjua, Xinzi Liu, Sailing He
Summary: This study presents a strategy to control the photoluminescence emission of aluminum quantum dots (AlQDs). It is found that surfactants and phosphonic acids (PAs) competitively bind to the surface of AlQDs, and this binding is affected by the space volume of surfactants and charge of head groups. The emission properties of AlQDs mainly originate from the surface-mediated states, and the red-shifting of the emission peak is a result of increased amount of PAs on the surface, possibly related to the surface oxygen presented in both ligands and surfactants. Overall, this study provides a method to control the photoluminescence of AlQDs by changing the surfactants and surface ligands, which has important implications for their applications in photonics, energy and environment, as well as biomedicine.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Multidisciplinary Sciences
Jing Chen, Yanxiao Zhao, Xuanjie Luo, Hao Hong, Tongqing Yang, Shen Huang, Chunli Wang, Hongyu Chen, Xin Qian, Mingfeng Feng, Zhengqiang Chen, Yongxin Dong, Zhenchuan Ma, Jia Li, Min Zhu, Sheng Yang He, Savithramma P. P. Dinesh-Kumar, Xiaorong Tao
Summary: Phytohormone signalling pathways play an important role in plant defence against pathogens. This study revealed that a pepper NLR protein Tsw interacts with a viral effector NSs to inhibit phytohormone receptor function, promoting virulence. Moreover, the plant has evolved a counter-virulence strategy by recognizing the interference of phytohormone signalling through a NLR protein with a structure resembling phytohormone receptors.
Correction
Multidisciplinary Sciences
Jing Chen, Yanxiao Zhao, Xuanjie Luo, Hao Hong, Tongqing Yang, Shen Huang, Chunli Wang, Hongyu Chen, Xin Qian, Mingfeng Feng, Zhengqiang Chen, Yongxin Dong, Zhenchuan Ma, Jia Li, Min Zhu, Sheng Yang He, Savithramma P. P. Dinesh-Kumar, Xiaorong Tao
Article
Materials Science, Multidisciplinary
Yuwei Sun, Zhipeng Hu, Kezhang Shi, Tingbiao Guo, Yuxin Xing, Yi Jin, Sailing He
Summary: Scientists demonstrate a resonant planar chiral dielectric metasurface design for circularly polarized emission (CPE). The design is easy to fabricate, with an extremely high and angle-insensitive far-field circular polarization degree. Experimental results show a 57-fold enhancement in photoluminescence from a thin film of PbS/CdS quantum dots coated on the metasurface, with a far-field degree of circular polarization as high as 0.74.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Optics
Yuting Zou, Zongxing Lin, Sailing He
Summary: This paper proposes a low-cross-talk and thermo-insensitive 1 x 4 coarse wavelength-division multiplexing device on the silicon-on-insulator platform. Compact Mach-Zehnder interferometers (MZIs) and slot waveguides are used to achieve wavelength-insensitive power splitting, while the trade-off between the opposite thermo-optical coefficients of the Si core and SU8 cladding is utilized to overcome the strong thermo-optic effect of silicon.
Article
Optics
Xiaoxuan Zheng, Zongxing Lin, Qiangsheng Huang, Sailing He
Summary: A novel structure utilizing a densely packed bent waveguide array is presented to eliminate mode hybridization in X-cut LiNbO3. The proposed structures show a polarization extinction ratio of -30 dB across all bend radii and low excess loss.
Article
Optics
Qin Tan, Shengnan Wu, Zhenchao Liu, Xiaolu Chen, Sailing He
Summary: A compact label-free optofluidic sensor based on a polished hollow core Bragg fiber (HCBF) was proposed, which can simultaneously measure cortisol concentration and surrounding temperature in real-time. The sensor consists of fusion splicing single mode fiber (SMF), multimode fiber (MMF), and HCBF. By taking advantage of the high refractive index (RI) layers of HCBF, the sensor offers high sensitivity and specific sensing of cortisol with a limit of detection (LOD) of 4.303 pM. The sensor has a compact structure, enables temperature compensation, and is suitable for in-situ monitoring and high-precision sensing of cortisol and other biological analytes.
Article
Engineering, Electrical & Electronic
Jiahan Tian, Tingbiao Guo, Nan He, Ji Du, Qiangsheng Huang, Xiaojian Hong, Chao Fei, Yuan Wang, Tianyi Zhang, Junping Zhang, Sailing He
Summary: Modulating retro-reflector (MRR) free-space optical (FSO) communication technology is crucial for small-sized optical links and holds promise for application in small platforms. In this article, a wide field-of-view (FOV) MRR using an image space telecentric lens is proposed, and a bidirectional FSO communication system is experimentally demonstrated. The experimental results show that the designed MRR has a FOV of up to 110 degrees, achieving low bit error rates for both downstream and upstream signals.
IEEE PHOTONICS JOURNAL
(2023)
Article
Optics
Zijian Lin, Tingbiao Guo, Xiao Chen, Jiahan Tian, Zhi Zhang, Sailing He
Summary: This paper proposes a new method for spectral imaging, which combines a liquid crystal cell with a commercial color camera. The method achieves high-quality multispectral imaging with a high frame rate and overcomes the tradeoff between spectral resolution and time resolution. The potential application of the method in metamerism recognition is demonstrated.
Article
Computer Science, Information Systems
Dawei Gong, Lingling Yan, Binbin Gu, Ruili Zhang, Xinli Mao, Sailing He
Summary: The study aims to develop a computer-assisted diagnosis system for distinguishing different types of chronic gastritis. By utilizing a novel network model and image analysis methods, the study achieved breakthroughs in high accuracy and minimal parameter requirements.
Article
Engineering, Electrical & Electronic
Zongxing Lin, Sailing He
Summary: In this article, a high-performance polarization beam splitter (PBS) based on a 220-nm SOI platform is proposed and experimentally demonstrated. The proposed PBS utilizes a sub-wavelength grating-assisted adiabatic directional coupler and a simple filter to achieve high separation and low insertion loss for TE and TM modes.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
He Zhu, Jing Luo, Jiaqi Liao, Sailing He
Summary: In this paper, a hyperspectral transmission microscopic imaging (HTMI) system is developed for precise identification and classification of mixed pathogenic bacteria. The system has high spatial and spectral resolution, and achieves a high classification accuracy of 93.6% using a simple PCA-SVM method.
PROGRESS IN ELECTROMAGNETICS RESEARCH-PIER
(2023)
Article
Engineering, Electrical & Electronic
Haozhe Wang, Dawei Gong, Guokai Cheng, Jiang Jiong, Dun Wu, Xinhua Zhu, Shengnan Wu, Gaoao Ye, Lingling Guo, Sailing He
Summary: This paper proposes a high-temperature anomaly detection method based on SegFormer in the infrared image of power transmission and transformation equipment. By preprocessing and segmenting the infrared images, it can detect temperature anomalies in key parts and has important practical value.
PROGRESS IN ELECTROMAGNETICS RESEARCH M
(2023)
Article
Engineering, Electrical & Electronic
Jing Pan, Yuanqing Yao, Liu Yang, Hui Li, Sailing He
Summary: In this study, an optically transparent and flexible wideband antenna is proposed and experimentally demonstrated. The antenna is based on sub-micron thick micro-metallic meshes, which provide high visible transmittance and low sheet resistance. The antenna shows excellent comprehensive performance with superior transparency, radiation efficiency, and mechanical properties, making it suitable for practical applications and the emerging field of flexible and wearable electronics.
PROGRESS IN ELECTROMAGNETICS RESEARCH-PIER
(2023)
