Article
Optics
Faramarz Alihosseini, Zahra Heshmatpanah, Hesam Zandi
Summary: We have proposed and designed a high-speed and high-performance optically controlled terahertz (THz) intensity modulator based on the free carrier modulation of a GaAs semiconductor. The modulator benefits from the strong interaction between the THz wave and the photoconductive substance to achieve deep modulation with GHz speed, even at low optical power.
APPLIED PHYSICS B-LASERS AND OPTICS
(2022)
Article
Chemistry, Analytical
Vincas Tamosiunas, Linas Minkevicius, Ignotas Bucius, Domas Jokubauskis, Karolis Redeckas, Gintaras Valusis
Summary: Terahertz imaging is a powerful technique for exploring non-conducting materials and their arrangements. This study presents the design and performance of a low-cost THz imaging system, and discusses further approaches for cost reduction.
Article
Optics
Jia Ran, Tao Chen, Honggang Hao, Dandan Wen, Xiaolei Zhang, Yi Ren
Summary: In this study, an electrically controlled terahertz modulator with slow wave effect and localized field is proposed, using a high electron mobility transistor integrated metasurface. The resonant modes are directly controlled through HEMT switches, resulting in a high modulation depth and group delay.
Article
Nanoscience & Nanotechnology
Yanli Xu, Chuan Zhang, Weimin Li, Rong Li, Jiangtao Liu, Ze Liu, Zhenhua Wu
Summary: An ultraviolet electro-optic modulation system based on graphene-plasmonic metamaterials nanomechanical system (NEMS) with superlubricity has been investigated. The system achieves a high modulation depth and fast response speed due to the strong optical absorption intensity of graphene and the combination of metamaterial structure based on surface plasmons.
Article
Nanoscience & Nanotechnology
Elham Heidari, Hamed Dalir, Farzad Mokhtari Koushyar, Behrouz Movahhed Nouri, Chandraman Patil, Mario Miscuglio, Deji Akinwande, Volker J. Sorger
Summary: With the increasing need for data processing, balancing high-speed and energy consumption in optoelectronic devices is becoming difficult. This paper introduces a double-layer graphene optical modulator integrated on a Silicon photonics platform, achieving 60 GHz speed, micrometer compactness, and high efficiency.
Article
Physics, Applied
Yuwei Zhou, Minhan Mi, Mei Yang, Yutong Han, Pengfei Wang, Yilin Chen, Jielong Liu, Can Gong, Yiwei Lu, Meng Zhang, Qing Zhu, Xiaohua Ma, Yue Hao
Summary: By regrowing Ohmic contact with a contact ledge structure, high-performance millimeter-wave InAlN/GaN HEMT is fabricated for low voltage RF applications, showing improved output current density and power-added efficiency.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
J. I. A. N. Z. H. O. U. Huang, Bin Hu, G. U. O. C. U. Wang, Z. O. N. G. Y. U. A. N. Wang, J. I. N. L. O. N. G. LI, J. U. A. N. Liu, Y. A. N. Zhang
Summary: This work demonstrates a reconfigurable THz phase modulator with 5x5 independently tunable units enabled by switching the voltages applied on 10 graphene ribbons. The efficiency of the device is enhanced by 2.7-3.6 times under different graphene chemical potentials through introducing quasi bound states in the continuum resonance using a designed double C-shaped antenna. Experimental results show the formation of a focus with a changed focal length from 14.3mm to 22.6mm. This work provides potential for compact THz spatial light modulators that may be applied in THz communication, detection, and imaging.
PHOTONICS RESEARCH
(2023)
Review
Chemistry, Multidisciplinary
Jinyang Chen, Jie Yang, Yunlong Guo, Yunqi Liu
Summary: This review summarizes strategies to improve electron transport in semiconducting polymers through acceptor modulation, including using various acceptor types and introducing strong electron-withdrawing groups. The relationships between molecular structure, thin film morphology, processing conditions, and device performances are comprehensively discussed.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Ao Liu, Huihui Zhu, Taoyu Zou, Youjin Reo, Gi-Seong Ryu, Yong-Young Noh
Summary: This study presents the synthesis of wafer-scale ultrathin bismuth sulfide and tellurium semiconductors using room temperature thermal evaporation, which demonstrate high performance in complementary electronics. The fabricated thin-film transistors exhibit high mobility and stability, and complementary inverters show remarkable voltage transfer characteristics with a high gain. This work paves the way for scalable and cost-effective deposition of semiconductors for integrated electronics.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Hang Liu, Ruofan Sun, Xu Lu
Summary: This study successfully synthesized Bi2O2Te nanosheets and controlled their thickness by adjusting the growth conditions. The experimental results showed that Bi2O2Te exhibited exceptional electrical performance, especially with ultrahigh mobility at low temperatures. This suggests that Bi2O2Te is a promising candidate for highly efficient electronic devices.
INORGANIC CHEMISTRY
(2023)
Article
Engineering, Electrical & Electronic
Weijian Cai, Jianfang Zhu, Youpeng Yang, Xiaoran Wang, Zhengfang Qian, Shuting Fan
Summary: In this study, a double-open hexagonal ring metamaterial (MM) with high refractive index sensitivity was designed and fabricated to improve the detection sensitivity of terahertz (THz) biosensors. The resonant properties of the MMs were demonstrated through simulations and experiments. The MM sensor showed high sensitivity and low detection limits to glucose and bovine serum protein (BSA) solutions, indicating potential applications in the THz biomedical field.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Xingyu Jiang, Jie Lu, Di Xue, Yujia Wei, Yadan Zhang, Jidong Zhang, Zi Wang, Lizhen Huang, Lifeng Chi
Summary: A high performance near-infrared organic phototransistor has been achieved by incorporating a small molecule acceptor as an electron trapping site in narrow-bandgap conjugated polymer films. With just a 10% addition of the acceptor molecule, the photoresponse to 850 nm light has been significantly improved, reaching a maximum photoresponsivity of 2000 A W-1, high detectivity of 10(16) Jones, and a fairly good photosensitivity in the order of 10(6).
CHEMICAL COMMUNICATIONS
(2021)
Article
Physics, Applied
Lian Zhang, Zhe Cheng, Yawei He, Jianxing Xu, Lifang Jia, Xinyuan Wang, Shiyong Zhang, Wei Tan, Yun Zhang
Summary: This study focuses on the electron concentration and mobility of SAG n(+)-GaN on InAlN/GaN HEMTs using MOCVD, revealing that the electron mobility of SAG GaN is significantly affected by thickness. A gas flow model is proposed to guide the regrowth for improving electron mobility. High mobility and low resistance are achieved in the SAG GaN, contributing to the performance of the HEMTs.
APPLIED PHYSICS LETTERS
(2021)
Article
Optics
Yaokai Niu, Kaixi Bi, Qiannan Li, Xiaoxue Bi, Siyuan Zhou, Wenxiao Fu, Shuai Zhang, Shuqi Han, Jiliang Mu, Wenping Geng, Linyu Mei, Xiujian Chou
Summary: Sandwich-type structure based on Salisbury screen effect is a simple and effective strategy for high-performance terahertz absorption. A multilayer metal/polyimide/graphene (M/PI/G) absorber was proposed based on graphene Salisbury shielding, demonstrating improved absorption performance. Increase in dielectric layer thickness was found to increase the number of resonance peaks in the absorber. The absorber achieved an absorption bandwidth of approximately 160%, outperforming previous reported THz absorbers. The absorber can be easily integrated with semiconductor technology, making it highly practical for efficient THz-oriented devices.
Article
Chemistry, Multidisciplinary
Xiaofei Guo, Yihan Zhang, Yongxu Hu, Jiaxin Yang, Yang Li, Zhenjie Ni, Huanli Dong, Wenping Hu
Summary: This study demonstrates the potential of mesopolymers with high solubility, free of structural defects, and tunable molecular weights in organic optoelectronics, particularly in the construction of organic light emitting transistors with strong emission and ambipolar carrier mobility.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
