Article
Chemistry, Multidisciplinary
Omnia Samy, Mohamed Belmoubarik, Taiichi Otsuji, Amine El Moutaouakil
Summary: This study presents a thin THz absorber that can be easily tuned through the whole THz range (0.1-10 THz) by applying a low gate voltage (<1 V). The structure is based on cheap and abundant materials (MoS2/graphene). The absorptance frequency and width can be controlled by varying the structure and substrate dimensions, making it a promising alternative to expensive THz metamaterial-based absorbers.
Article
Chemistry, Multidisciplinary
Hong Su, Zesong Zheng, Zhisheng Yu, Shiping Feng, Huiting Lan, Shixing Wang, Min Zhang, Ling Li, Huawei Liang
Summary: In this paper, a broadband terahertz modulator based on a high-resistance silicon substrate and a layer-dependent PtSe2 nanofilm is proposed and experimentally demonstrated. The results show that a 3-layer PtSe2 nanofilm has better surface photoconductivity in the terahertz band and exhibits a higher plasma frequency and a lower scattering time compared to films with more layers. By utilizing terahertz time-domain spectroscopy, it is shown that the 3-layer PtSe2 film achieves broadband amplitude modulation with a modulation depth of 50.9% at a specific pump density. This work confirms the suitability of PtSe2 nanofilm devices for terahertz modulation.
Article
Optics
Huaixing Wang, Furi Ling, Chunya Luo, Dan Li, Yongrui Xiao, Zeyuan Chang, Zhibo Xu, Ying Zeng, Weijun Wang, Jianquan Yao
Summary: An active terahertz modulator based on optically controlled organometal halide perovskite MAPbI(2)Br is proposed in this paper. Experimental results demonstrate that the modulator exhibits obvious optical-power-dependent modulation effect on transmission of terahertz waves.
Article
Optics
Shengchao Gong, Mengxin Ren, Wei Wu, Wei Cai, Jingjun Xu
Summary: Spatial light modulators are devices used to modulate amplitude, phase, or polarization of light beams, considered as the backbone for optical information processing and future optical computing. The MS-OASLM, based on metasurface, achieves higher resolution than typical SLMs through nonlinear polarization control, offering potential for next generation all-optical information processing and high resolution display technologies.
PHOTONICS RESEARCH
(2021)
Article
Optics
Zhenbin Zhang, Zhimin Liu, Fengqi Zhou, Jiawei Wang, Yuqing Wang, Xiao Zhang, Yipeng Qin, Shanshan Zhuo, Xin Luo, Enduo Gao, Zao Yi
Summary: In this research, multilayer graphene metamaterials are utilized to achieve dynamic plasmon-induced transparency, allowing for redshifts or blueshifts at different frequencies. By adjusting the Fermi level of graphene, frequency selectors and electro-optical switches can be realized.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2021)
Article
Physics, Multidisciplinary
Jinwen Huang, Zhengyong Song
Summary: The terahertz waveguide modulator combining noble metal and graphene was studied, showing an increase in propagation loss with a change in Fermi level. Optimization of structure parameters led to a modulation depth of 6.1 dB μm(-1) at 5 THz. The device achieved a modulation depth of 1.5 dB μm(-1) at 10 THz while maintaining an effective mode area below 10(-5), due to the confinement of allowed mode in a small area.
Article
Nanoscience & Nanotechnology
Zhuang Ren, Jinyi Xu, Jinming Liu, Bolin Li, Chun Zhou, Zhigao Sheng
Summary: This article demonstrates an active and smart electro-optic terahertz modulator based on strongly correlated electron oxide vanadium dioxide. By applying an external electric field, the transmission, reflection, absorption, and phase of terahertz waves can be efficiently modulated, with the ability to stabilize the antireflection condition.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Xuejing Wang, Ryan Kaufmann, Andrew C. Jones, Renjie Chen, Towfiq Ahmed, Michael T. Pettes, Paul G. Kotula, Ismail Bilgin, Yongqiang Wang, Swastik Kar, Jinkyoung Yoo
Summary: Growing three-dimensional materials on two-dimensional van der Waals surface is effective for stacking transferrable membranes. Nucleation of hexagonal germanium grains within a continuous crystalline film is achieved by chemical vapor deposition on monolayer molybdenum disulfide substrates. The hexagonal Ge film shows higher reflectivity in the infrared spectral range compared to cubic Ge due to the narrower band gap and higher carrier concentration.
MATERIALS TODAY ADVANCES
(2023)
Article
Engineering, Electrical & Electronic
Zifeng Chen, Kuankuan Wang, Quanan Chen, Chun Jiang, Yong Wei, Hua Liu, Mingzhi Lu, Qiaoyin Lu, Weihua Guo
Summary: A tunable light source with narrow linewidth, small size, and low power consumption has been developed for high-speed digital coherent communication system. A Nano-ITLA based on the thermo-optically tuned MCI laser is demonstrated, which achieves a quasi-continuous tuning range and compact size with high performance.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Myunghwan Kim, Sangin Kim, Soeun Kim
Summary: A new type of mid-infrared ultra-compact optical modulator composed of a graphene metasurface is proposed in this study. Unlike previous schemes, this modulator utilizes the topological characteristic of the isofrequency contour in the hyperbolic metasurface to modulate transmission, providing a modulation depth of 10.7 dB with a length of 750 nm, which is approximately 1/30 of an operating wavelength.
Article
Multidisciplinary Sciences
Yanfei Dong, Dingwang Yu, Gaosheng Li, Mingtuan Lin, Li-An Bian
Summary: A new type of THz metamaterial modulator based on VO2 has been proposed, capable of dynamic modulation at 2.5 THz and adjustable absorption performance across the band. It shows the ability to control tunable manipulation on transmission/reflection responses and has potential applications in thermal imaging, THz detection, active modulators, etc.
Article
Physics, Multidisciplinary
Bin Zou, Qing-Qing Li, Yu-Ping Yang, Hai-Zhong Guo
Summary: The study focuses on optically tuned dielectric parameters of strontium titanate thin films grown epitaxially on silicon wafers, revealing notable changes in the optical parameters with the pump power of the external laser. This research holds great significance for rapid and non-contact THz phase-modulation technology and provides a powerful tool for tuning the dielectric properties of STO thin films.
Article
Physics, Multidisciplinary
Mingyang Yang, Ming Zhou, Jianwen Yu, Yibo Zhang, Benyan Xu, Wenjun Cheng, Xuyin Li
Summary: This paper demonstrates a Fabry-Perot cavity structure using a multilayer film with an ultrathin metal film for absorbing infrared rays, while enhancing terahertz wave absorption with periodic microstructures. The structure has low emissivity in the atmospheric window and high emissivity in the nonatmospheric window, potentially improving stealth performance. It offers a simple structure and low manufacturing cost, which may present a new strategy for infrared and terahertz compatible stealth technology.
FRONTIERS IN PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Jian Yang, Shuai Meng, Yuchen Li, Yunxia Ye, Jing Tan, Qijun Li, Xudong Ren
Summary: A broadband, low-cost, and flexible THz absorber is achieved using annealed carbonized sponge obtained from a commercially available melamine sponge through a pyrolysis process. The obtained CS shows excellent shielding and absorption performance covering a wide frequency bandwidth, far extending most reported materials. This efficient THz absorber has potential applications in electromagnetic stealth, shielding, and beyond, as demonstrated by THz transmission and reflection imagings.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Chaojian Hou, Kun Wang, Wenqi Zhang, Donglei Chen, Xiaokai Wang, Lu Fan, Chunyang Li, Jing Zhao, Lixin Dong
Summary: The current state-of-the-art in situ transmission electron microscopy (TEM) characterization technology can manipulate specimens at the nanoscale and provide atom-level material attributes. However, there is a barrier between material attributes investigations and device-level application explorations due to immature in situ TEM manufacturing technology and sufficient external stimuli. This study proposes an in situ opto-electromechanical TEM characterization platform by integrating an ultra-flexible micro-cantilever chip with optical, mechanical, and electrical coupling fields. The platform enables static and dynamic in situ device-level TEM characterizations using molybdenum disulfide (MoS2) as the channel material. The experiments demonstrate electron-beam modulation behavior and bending of MoS2 nanodevices, revealing piezoresistive and opto-electromechanical coupling properties. Real-time atom-level characterization is achieved using this approach, providing a step towards advanced in situ device-level TEM characterization technology.
ADVANCED MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Tianyi Zhang, Wenchang Li, Jinyu Xiao, Jian Liu
Summary: A new full-chip thermal field reconstruction strategy is proposed in this study, which utilizes a low-dimensional linear model and dictionary learning technology to improve reconstruction accuracy, and incorporates the minimum weighted mean square error evaluation method to reduce the false alarm rate. Additionally, a temperature sensor placement algorithm is proposed. Experimental results show that this strategy can reconstruct the full thermal field with more precise accuracy near the triggering threshold and achieve the lowest false alarm rate compared to the state of the art.
IET CIRCUITS DEVICES & SYSTEMS
(2022)
Article
Materials Science, Multidisciplinary
Wei Li, Benjia Zhu, Mathias Uller Rothmann, Amelia Liu, Weijian Chen, Yen Yee Choo, Narendra Pai, Wenxin Mao, Tian Zhang, Qiaoliang Bao, Xiaoming Wen, Udo Bach, Joanne Etheridge, Yi-Bing Cheng
Summary: The study demonstrates that halide segregation and I-V hysteresis in mixed halide inorganic CsPbIBr2 solar cells can be effectively mitigated by introducing an intermediate phase-enhanced Ostwald ripening through the control of chemical composition in the precursor solution. By adjusting the stoichiometric ratios of PbBr2 and CsI, improved solar cell performance can be achieved, with excess lead phase promoting Ostwald maturation and defect extinction. Ultimately, the CsPbIBr2 solar cell with a PbBr2-excess precursor composition achieves a high power conversion efficiency and external quantum efficiency.
SCIENCE CHINA-MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Hongtao Zhou, Runjiang Dou, Li Cheng, Jian Liu, Nanjian Wu
Summary: Connected component labeling is crucial in computer vision applications, but existing algorithms often generate excessive provisional labels and have varying processing times. To address these issues, a new two-scan CCL algorithm is proposed in this study, which effectively reduces the number of provisional labels and achieves quick processing.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2022)
Article
Physics, Applied
Tiangui Hu, Xiaodong Li, Chang Liu, Shan Lin, Kaiyou Wang, Jian Liu, Lixia Zhao
Summary: A new type of conical nanostructured GaN and its high-performance metal-semiconductor-metal photodetectors are reported. Compared with planar detectors, the conical nanostructured detectors exhibit higher photocurrent, responsivity, and detectivity at the same voltage.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Qiwen Liao, Yuguang Zhang, Siyuan Ma, Lei Wang, Leliang Li, Guike Li, Zhao Zhang, Jian Liu, Nanjian Wu, Liyuan Liu, Yong Chen, Xi Xiao, Nan Qi
Summary: This article presents a 50-Gb/s optical transmitter design, which includes a distributed CMOS driver and a silicon-photonic modulator. By utilizing specific modulation method and driver design, high-performance modulation is achieved, while signal synchronization is achieved through segmented multiplexing and clock phase interpolation. Test results show that the transmitter has good extinction ratio and level mismatch, as well as low power consumption.
IEEE JOURNAL OF SOLID-STATE CIRCUITS
(2022)
Article
Engineering, Electrical & Electronic
Jian He, Yuguang Zhang, Han Liu, Qiwen Liao, Zhao Zhang, Miaofeng Li, Fan Jiang, Jingbo Shi, Jian Liu, Nanjian Wu, Yong Chen, Patrick Yin Chiang, Ningmei Yu, Xi Xiao, Nan Qi
Summary: This article presents a reconfigurable silicon-photonics transmitter for short-reach optical interconnects, combining a 65-nm CMOS driver with a 180-nm SOI-CMOS silicon-photonic Mach-Zehnder Modulator. The transmitter achieves high modulation efficiency and data rates with low power consumption.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2022)
Article
Optics
Haiyang Ren, Weiwei Yue, Jian Liu, Liyuan Liu, Zhaoxin Geng
Summary: A flexible metasurface based on parylene-C film was proposed in this study, featuring elliptical split-ring units that can function as 2D beam deflectors, 3D beam deflectors, or vortex generators in the THz band. The metasurface demonstrates broadband effects and enables modulation of THz waves for various applications in THz optical field modulation and communication.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Weihao Fang, Zhengtai Ma, Xiaoqing Lv, Jian Liu, Weihua Pei, Zhaoxin Geng
Summary: A novel flexible THz metamaterial biosensor based on a low refraction index substrate is proposed for rapid label-free detection of cancer biomarkers. The biomarkers are modified using a non-metal modification method, achieving high refractive index sensitivity and uniform modification effect. The biosensor shows consistent results with traditional clinical tests.
Article
Chemistry, Analytical
Weihao Fang, Xiaoqing Lv, Zhengtai Ma, Jian Liu, Weihua Pei, Zhaoxin Geng
Summary: A flexible terahertz metamaterial biosensor based on parylene C substrate was proposed for label-free and non-destructive detection of breast cancer cell growth and migration.
Article
Electrochemistry
Tiangui Hu, Chang Liu, Jian Liu
Summary: Nanostructured GaN with a conical shape is fabricated using a simple method of electrochemical etching and ICP etching, which significantly improves the water splitting performance. The conical GaN shows increased light absorption and higher water splitting current density compared to planar GaN. This study provides a simple approach to fabricate high-performance nanostructured GaN and expands the application of III-nitrides in efficient energy storage and conversion.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Engineering, Electrical & Electronic
Jian He, Donglai Lu, Haiyun Xue, Sikai Chen, Han Liu, Leliang Li, Guike Li, Zhao Zhang, Jian Liu, Liyuan Liu, Nanjian Wu, Ningmei Yu, Fengman Liu, Xi Xiao, Yong Chen, Nan Qi
Summary: This paper presents a hybrid-integrated optical transceiver front-end for beyond-400G short-reach optical links, with developed drivers and transimpedance amplifiers for optical transmission and reception.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2022)
Article
Engineering, Electrical & Electronic
Qian Luo, Chunhe Yao, Ke Ning, Xuemin Zheng, Mingxin Zhao, Li Cheng, Shuangming Yu, Jian Liu, Nanjian Wu, Liyuan Liu
Summary: The study introduces a vision chip integrating an imager and a vision processor with a dual-issue micro-architecture, capable of efficiently implementing deep neural networks and traditional computer vision algorithms.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2022)
Article
Engineering, Electrical & Electronic
Kai Ma, Tao Yin, Na Tian, Zhe Wang, Tian Zhao, Jian Liu, Nanjian Wu, Liyuan Liu
Summary: This paper investigates the impact of multi-event mode and time-gating method on enhancing the imaging capabilities of a LiDAR system, using a probability distribution perspective. A behavioral model is established for system simulation and parameter optimization, reducing the design and simulation cycle.
IEEE PHOTONICS JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Tao Hou, Sicen Tao, Haoran Mu, Qiaoliang Bao, Huanyang Chen
Summary: By combining transformation optics and van der Waals layered materials, a proposed invisibility concentrator utilizes a thin layer of alpha-MoO3 to wrap around a cylinder, inheriting invisibility and energy concentration effects. Analytical calculation and numerical simulations confirm the device's functionalities, providing guidelines for future experimental verification.
Article
Chemistry, Multidisciplinary
Shenghuang Lin, Nianqing Fu, Qiaoliang Bao
Summary: This article discusses the application of elemental 2D materials in solar cells, pointing out that they have made significant progress in improving efficiency and showcasing the development trend as transport layers. This technology provides new hope for meeting the energy demands in modern society.
CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
(2021)
