Article
Optics
Yulian Li, Wei Gao, Li Guo, Zihao Chen, Changjian Li, Haiming Zhang, Jiajia Jiao, Bowen An
Summary: A dynamically tunable ultra-broadband terahertz perfect metamaterial absorber based on vanadium oxide (VO2) has been proposed, with absorption bandwidth greater than 90% from 3.03 to 8.13 THz. By changing the conductivity of VO2, the absorption intensity can be dynamically tuned from 1.47% to 100%, showing significantly improved bandwidth and flexibility compared to previous reports.
Article
Optics
Baoku Wang, Ke Gai, Ruoxing Wang, Fei Yan, Li Li
Summary: This paper presents an interesting scheme of an ultra-broadband perfect terahertz (THz) absorber using a periodic-conductivity graphene metasurface. By modulating the conductivity of graphene in a periodic manner, the absorber can generate dense high-order resonance modes and achieve ultra-broadband continuous absorption. This scheme is significant for the development of broadband THz absorbers and has promising application prospects in THz stealth, imaging, and communication fields.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Dandan Chen, Bijun Xu, Zhifang Qiu, Xiaogang Wang, Jun Wu, Kaikai Huang
Summary: In this study, a nickel-based microstructure ultra-broadband absorber for terahertz waves is proposed, which can achieve efficient absorption across the entire terahertz spectrum (0.1 THz-16 THz). The absorber is polarization-insensitive and allows for broad-angle incidence, with low cost and potential applications in various industries including terahertz stealth, sensor technology, imaging, and communication.
RESULTS IN PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Yujie Zhong, Yi Huang, Shuncong Zhong, Tingting Shi, Fuwei Sun, Tingling Lin, Qiuming Zeng, Ligang Yao, Xuefeng Chen
Summary: This study achieves frequency-agile absorption adjustments by utilizing the coupling between total reflection prism and electrically-driven MoS2. The redistribution of electric field and susceptible dielectric response are found to be attributed to limited spatial near-field perturbation. The study also demonstrates that perturbed MoS2 plasmon modes promote the formation of dual-phase singularities to suppress attenuation of absorption amplitude, extending the relative tuning range.
Article
Materials Science, Multidisciplinary
Jun Zhu, Changsong Wu, Yihong Ren
Summary: The study proposed a metamaterial absorber composed of graphene, and demonstrated that dynamic tuning of the absorption range and absorption bandwidth could be achieved by adjusting the Fermi level of the graphene. This has theoretical and engineering significance in the domains of thermal photo-voltaics, solar cells, and sensors.
RESULTS IN PHYSICS
(2021)
Article
Multidisciplinary Sciences
Nanli Mou, Bing Tang, Jingzhou Li, Hongxing Dong, Long Zhang
Summary: Researchers have developed a thermally switchable terahertz metasurface that can achieve high transmission and ultra-broadband absorption at different temperatures, making it insensitive to the incident angle. The structure is highly scalable and has potential applications in areas such as optical switching, terahertz imaging, and filtering.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Guan Wang, Tong Wu, Jijuan Jiang, Yang Jia, Yang Gao, Yachen Gao
Summary: A switchable multifunctional terahertz absorber based on graphene and vanadium dioxide (VO2) is proposed in this study, and its absorption properties and tuning are investigated. The absorber exhibits broadband absorption in the dielectric phase and narrowband absorption in the metallic phase.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Optics
Lingyun Zhuang, Wenjing Zhang, Jietao Liu, Minghao Chao, Qingsong Liu, Bo Cheng, Yun Xu, Guofeng Song
Summary: A multilayer terahertz absorber composed of hybrid graphene and vanadium dioxide (VO2) is proposed in this paper. Three different switchable absorption states are achieved in one structure by controlling graphene and tuning VO2. The absorber has potential applications in modulation, filtering, detection, and other fields.
Article
Engineering, Electrical & Electronic
Xingfang Luo, Peiwen Xiang, Heming Yu, Shan Huang, Ting Yu, Yuan-Feng Zhu
Summary: In this research, a terahertz metamaterials broadband perfect absorber based on MoS2 is proposed. By introducing fillet MoS2 metamaterial structure, the absorber achieves nearly perfect absorption performance in a specific frequency range, providing important applications for terahertz modulation equipment.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Didi Song, Kaihua Zhang, Mengdan Qian, Yufang Liu, Xiaohu Wu, Kun Yu
Summary: Solar energy is a clean and renewable energy source that addresses the current energy and climate crisis. Near-perfect broadband solar absorbers can assist in developing an effective solar energy-harvesting system. This study presents a metamaterial perfect absorber design that operates in the ultraviolet to near-infrared spectral range, utilizing a titanium nanoarray coupled to an optical cavity. Numerical simulations demonstrate that the optimal absorber achieves an average absorption efficiency of up to 99.84% in the 200-3000 nm broadband range. It is also shown that the absorber possesses desirable features for practical solar energy absorption and harvesting, such as precision tolerance, polarization independence, and large angular acceptance.
Article
Materials Science, Multidisciplinary
Haibo Hu, Junhua Gao, Wan Wang, Shiwei Tang, Lei Zhou, Qiong He, Haichen Wu, Xiaoying Zheng, Xiaoyun Li, Xiuhong Li, Alexander A. Rogachev, Hongtao Cao
Summary: In this study, a closed plasmonic perfect absorber with ultrathin multi-scale silver nanostructures in SiO2 matrix was fabricated through direct self-organization growth. The designed microstructures achieved a high absorptance across a wide wavelength range and a high visible absorptance.
APPLIED MATERIALS TODAY
(2022)
Article
Materials Science, Multidisciplinary
Guang Feng, Zhihui Chen, Xiaowei Wang, Xiao Liu, Fei Sun, Yibiao Yang
Summary: The study proposes a double truncated pyramid structure with ultra-broadband terahertz absorption characteristics achieved by combining different material layers. The theoretical simulation results show that the absorber has a high absorption coefficient in the frequency range of 1.49 THz to 12.72 THz. The structure has potential applications in sensing, stealth, and other fields.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Optics
Ting Zhang, Sen Yang, XinYing Yu
Summary: The designed multiple broadband terahertz perfect absorber can dynamically adjust absorption rate in the range of 0 to 9.5 THz, utilizing VO2 layer, metal ground plane, and SiO2 layer. It features wide-angle absorption and polarization insensitivity, suitable for applications in THz sensors, detectors, and stealth technology.
OPTICS COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Gui Jin, Tianle Zhou, Bin Tang
Summary: In this work, we theoretically propose an anisotropic metamaterial absorber composed of alpha-MoO3 rings and dielectric layer, and investigate the influence of geometric parameters on its optical absorption performance. The designed absorber exhibits ultra-narrowband perfect absorption for specific polarizations in the visible light region and shows excellent angular tolerance for oblique incidence. Furthermore, by adjusting the thickness of the dielectric layer, the single-band perfect absorption can be extended to multi-band perfect absorption. These findings have potential applications in the design of anisotropic optical devices with tunable spectrum and selective polarization in the visible light region.
Article
Chemistry, Multidisciplinary
Mohammad Muntasir Hassan, Fariba Islam, Md Zunaid Baten, Samia Subrina
Summary: This study optimizes the InAs nanowire structure to achieve ultra broadband absorption, showing that multi-radii NW arrays exhibit superior performance and robustness at varying angles of incidence with negligible effect on absorption spectra.
Article
Chemistry, Physical
Fei Zhao, Jiangchuan Lin, Zhenhua Lei, Zao Yi, Feng Qin, Jianguo Zhang, Li Liu, Xianwen Wu, Wenxing Yang, Pinghui Wu
Summary: In this work, the performance of c-Si/ZnO heterojunction ultrathin-film solar cells is enhanced by an integrated structure of c-Si trapezoidal pyramids on the top and Al pyramids in the active layer. The top c-Si pyramid increases absorption of short wavelengths and the bottom Al pyramid improves overall optical absorption, resulting in a high absorption rate of 93.16%. The optimized current density and conversion efficiency of the solar cells are 41.94 mA cm(-2) and 18.97%, respectively. The solar cells show good absorption in a wide range of incident angles and the electric field intensity profile demonstrates excellent light-trapping performance.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Optics
Siyang Xiao, Fen Zhao, Dongying Wang, Junjie Weng, Yan Wang, Xin He, Huan Chen, Zhaojian Zhang, Yang Yu, Zhenfu Zhang, Zhenrong Zhang, Junbo Yang
Summary: In this study, a double-process genetic algorithm (DPGA) optimization is proposed to inverse design metalens with extended depth of focus (EDOF), aiming to address the drawbacks of existing designs. By adopting different mutation operators, DPGA shows significant advantages in searching for the ideal solution and achieves improved depth of focus and stable imaging quality.
Article
Chemistry, Physical
Wanlai Zhu, Yingting Yi, Zao Yi, Liang Bian, Hua Yang, Jianguo Zhang, Yang Yu, Chao Liu, Gongfa Li, Xianwen Wu
Summary: To improve optical fiber sensing performance and broaden its application, a photonic crystal fiber (PCF) plasmonic sensor with a U-shaped channel based on surface plasmon resonance (SPR) is proposed in this study. The influence rules of structural parameters, such as the radius of the air hole, the thickness of the gold film, and the number of U-shaped channels, were investigated using COMSOL and the finite element method. The dispersion curves, loss spectrum, and electric field intensity distribution were studied under various conditions. The proposed sensor achieved a maximum refractive index sensitivity of 24.1 mu m RIU-1 in the RI range of 1.38-1.43, with a FWHM of 10.0 nm, a FOM of 2410 RIU-1, and a resolution of 4.15 x 10(-6) RIU. The sensor combines the highly sensitive SPR effect and allows for real-time detection of the external environment. The detection range and sensitivity can be increased by adjusting the structural parameters. The sensor has a simple structure and excellent performance, providing a new approach for real-time detection and highly integrated sensing.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Ning Liu, Xi Yang, Jianfa Zhang, Zhihong Zhu, Ken Liu
Summary: In this paper, we demonstrated the room-temperature transfer-free excitonic nanolaser array by embedding continuous monolayer WS2 between Si3N4 microdisks and Al2O3. Lasing at room temperature is achieved with the help of high-quality-factor Si3N4 microdisks and the physical vapor deposition method for growing 2D gain material directly. This work provides a practical solution for large-scale and low-cost TMDC-based nanolaser arrays in integrated optical communication systems.
Article
Chemistry, Multidisciplinary
Zhengzhuo Zhang, Qiaoge Sun, Yansong Fan, Zhihong Zhu, Jianfa Zhang, Xiaodong Yuan, Chucai Guo
Summary: Researchers propose and simulate a kind of graphene-based perfect absorber that can generate low-threshold and high-extinction-ratio optical bistability in the near-IR band. The perfect absorption greatly enhances the interaction between input light and monolayer graphene in the absorber. With a large nonlinear coefficient and strong light-graphene interaction, the structure exhibits relatively low switching thresholds and an ultrahigh extinction ratio. The proposed bistable structure with ultra-compact size, low thresholds, high extinction ratio, and ultrafast response time has promising applications in high-performance all-optical communication devices.
Article
Engineering, Electrical & Electronic
Junjie Weng, Yang Yu, Jianfa Zhang, Dongying Wang, Zhechun Lu, Zhencheng Wang, Jianqiao Liang, Shumao Zhang, Xiangcheng Li, Yang Lu, Zhou Meng, Junbo Yang, Zhenrong Zhang
Summary: In this paper, a biomimetic optical skin (BOS) based on optical microfiber coupler neuron (OMCN) is proposed, which realizes multimodal tactile perception for the first time. BOS can sensitively detect temperature, contact force, vibration, and recognize the hardness and roughness of objects through human-like tactile sensing. Furthermore, the excellent repeatability and stability of BOS are investigated, laying the foundation for practical applications.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Jianqiao Liang, Yang Yu, Qiang Bian, Wenjie Xu, Zhencheng Wang, Shumao Zhang, Junjie Weng, Jiajian Zhu, Yong Chen, Xiaoyang Hu, Junbo Yang, Zhenrong Zhang
Summary: Metal coatings can protect optical fiber sensors and extend their lifespan in harsh environments. A nickel-coated fiber Bragg grating combined with an air bubble cavity Fabry-Perot interferometer fiber optic sensor was developed for simultaneous high-temperature and strain sensing. The sensor demonstrated successful testing at 545 degrees C for 0-1000 microstrain, and the characteristic matrix was used to separate temperature and strain. With its ability to attach to high-temperature metal surfaces, the metal-coated optical fiber sensor has potential applications in real-world structural health monitoring.
Article
Chemistry, Multidisciplinary
Qilin Hong, Jinbao Jiang, Siyu Zhou, Gongyu Xia, Ping Xu, Mengjian Zhu, Wei Xu, Jianfa Zhang, Zhihong Zhu
Summary: In this paper, a silicon-based on-chip Fano resonator with graphene nanoheaters is proposed and fabricated. The resonator has the characteristics of a high quality factor and low state-switching power, making it a viable option for large-scale tunable and low-power-consumption optical networks. It also has potential applications in optical filters and switches.
Article
Nanoscience & Nanotechnology
Jinbao Jiang, Feng Xiong, Linfeng Sun, Haitao Chen, Mengjian Zhu, Wei Xu, Jianfa Zhang, Zhihong Zhu
Summary: The search for new phase-change materials and understanding the phase transformation mechanism is important for memory and neuromorphic device applications. This study investigates the phase transformation of iron telluride (FeTe) starting from mechanically exfoliated van der Waals layers. The observed surficial amorphization and the reversibility of the phase transformation suggest potential applications of FeTe in neuromorphic devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
Qiang Bian, Hongtian Zhu, Jianqiao Liang, Yang Yu, Peiguang Yan
Summary: A mode field matching fusion splicing method between sapphire fiber and single-mode fiber was developed to solve the multimode issue, resulting in a quasi-single mode reflection spectrum from sapphire fiber Bragg grating. By optimizing the splicing parameters, a high-order modes suppression and a higher signal-to-noise ratio (SNR) were achieved. The improved fusion splicing method combined with a commercial single-mode interrogator enabled real-time temperature monitoring up to 1160 degrees C.
IEEE SENSORS JOURNAL
(2023)
Article
Optics
Jie Nong, Xinpeng Jiang, Xueling Wei, Yiyi Zhang, Ning Li, Xin Li, Huan Chen, Xin He, Yang Yu, Zhenfu Zhang, Zhenrong Zhang, Junbo Yang
Summary: This study proposes an optically transparent metamaterial with multi-band compatible camouflage capability based on the inverse design. The metamaterial exhibits high transmittance, low reflectance, high emissivity, and insensitivity to incident light and polarization.
Article
Optics
Hansi Ma, Te Du, Xinpeng Jiang, Zhaojian Zhang, Xin He, Huan Chen, Yang Yu, Zhenfu Zhang, Yunxin Han, Junbo Yang, Yuanxi Peng, Liang Fang
Summary: In this study, we successfully designed three-channel and four-channel dual-mode waveguide crossings using the inverse design method. Based on highly-symmetric structures, the TE0 and TE1 modes are efficiently propagated through the crossings. The experimental results demonstrate low insertion losses and crosstalks of these devices.
Article
Optics
Wei Xu, Qilin Hong, Ping Liu, Jialong Peng, Biao Yang, Jianfa Zhang, Zhihong Zhu
Summary: This study proposes high quality, tunable unidirectional guided resonances (UGRs) based on a silicon-on-lithium niobate (Si-on-LN) photonic crystal (PhC) slab, achieving high Q factors by adjusting the position of the UGRs. In addition, a Gires-Tournois interferometer (GTI) based on a UGR with a Q factor of 9465 is demonstrated, with adjustable group delay and operation wavelengths by tuning the refractive index of lithium niobate (LN) and the periods of the silicon bars. This research may find applications in various areas such as PhC surface-emitting lasers, dispersion compensation, and compression of light pulses.
Article
Chemistry, Analytical
Runing Lai, Hao Chen, Zigang Zhou, Zao Yi, Bin Tang, Jing Chen, Yougen Yi, Chaojun Tang, Jianguo Zhang, Tangyou Sun
Summary: This paper introduces a new theoretical proposal for a surface plasmon resonance terahertz metamaterial absorber with five narrow absorption peaks. By controlling the properties of graphene, the absorption rates and frequencies can be dynamically adjusted. The design features dynamic tunability, wide absorption characteristics, and excellent sensitivity.
Article
Chemistry, Physical
Wenxin Li, Jing Ma, Huafeng Zhang, Shubo Cheng, Wenxing Yang, Zao Yi, Hua Yang, Jianguo Zhang, Xianwen Wu, Pinghui Wu
Summary: In this research, a tunable broadband absorber based on a layered resonant structure was designed, which achieved high absorption (more than 0.9) in the frequency range of 18-28 THz. The high absorption was attributed to strong resonance absorption between the layers and the resonance of the localised surface plasmon. The absorber, consisting of three layers of Dirac semimetal and three layers of optical crystal plates on a gold substrate, also showed tunability and absorption stability.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
