Results 131 to 140 of about 1,429,782 (326)

Research on Direct Detection Method and Performance of Single-photon Counting Terahertz Radar

Leida xuebao
The conventional terahertz radar suffers from limited operation range for long-distance, noncooperative target detection due to the low transmitter power and atmospheric attenuation effect, both of which pose a hindrance in meeting the requirements of ...
Kang LIU, Hongxuan WU, Jun YI, Hongqiang WANG, Chenggao LUO   +4 more
doaj   +1 more source

Space‐Time Metasurface Antenna Enabled High‐Dimensional Electromagnetic Modulation for Intrinsic Physical Layer Security

Advanced Science, EarlyView.
The concept of high‐dimensional EM modulation using the STMA for physical layer secure communication is illustrated in figure. The STMA consists of a series of programmable unit cells, with 1‐bit reconfigurable phase states (0/π). The STMA is excited by a monochromatic continuous wave (CW) at frequency fc and controlled by a field‐programmable gate ...
Xinyu Fang, Yiqing Sun, Chenfeng Yang, Siran Wang, Zheng Xing Wang, Kaixu Wang, Geng‐Bo Wu   +6 more
wiley   +1 more source

Probing and modelling the localized self-mixing in a GaN/AlGaN field-effect terahertz detector

, 2012
In our previous work [Sun et al., Appl. Phys. Lett. 100, 013506 (2012)], we inferred the existence of localized self-mixing in an antenna-coupled field-effect terahertz detector.
H. Qin (秦华), H. Qin, Y. F. Sun, B. S. Zhang, J. D. Sun (孙建东), X. Y. Zhang, D. M. Wu (吴东岷), B. S. Zhang (张宝顺), J. D. Sun, Y. Cai (蔡勇), Y. Cai, X. Y. Zhang (张晓渝), Y. F. Sun (孙云飞), D. M. Wu, R. A. Lewis   +14 more
core   +1 more source

Hierarchical Physical‐Cyber Encryption via Metasurface‐Encoded Holographic Keys

Advanced Science, EarlyView.
ABSTRACT Physical‐layer encryption based on metasurfaces has emerged as a promising alternative to conventional algorithmic cryptography by embedding security into physical processes. However, most existing metasurface‐based encryption schemes operate within single‐stage or static frameworks, where correct physical illumination directly reveals the ...
Zhen Liu, Changhong Dai, Wei Zhu, Ruisheng Yang, Bohan Zhang, Lei Zhang, Bobo Du, Shengxiang Wang, Guangwei Hu   +8 more
wiley   +1 more source

A Novel Terahertz Detector Based on Asymmetrical FET Array in 55-nm Standard CMOS Process. [PDF]

Materials (Basel), 2022
Liu Y, Zhang X, Sun J, Tong L, Kong L, Deng T.   +5 more
europepmc   +1 more source

Efficient Polarization‐Entangled Photon‐Pair Generation by a Fiber‐In‐Line van der Waals Material

Advanced Science, EarlyView.
Telecom‐wavelength polarization‐entangled photon pairs are generated in a van der Waals‐material‐integrated all‐fiber device via spontaneous parametric down‐conversion. The demonstrated fiberized quantum light source bridges emerging 2D nonlinear materials and practical quantum photonic systems, opening new opportunities for scalable fiber‐based ...
Jungseok Choi, Seongju Ha, Seungjae Lim, Joohyeon Ahn, Jaekyoung Kim, Jong Hyuk Yim, Nam Hun Park, Youngdong Yoo, Jae‐Ung Lee, Hee Su Park, Sang Min Lee, Dong‐Il Yeom   +11 more
wiley   +1 more source

Influence of Substrate Material on Radiation Characteristics of THz Photoconductive Emitters

International Journal of Antennas and Propagation, 2015
We present in this paper spectral and spatial characteristics of terahertz emission from standard dipole antenna structures used as emitters depending on the substrate material.
Jens Klier, Garik Torosyan, Nina Susan Schreiner, Daniel Molter, Frank Ellrich, Wissem Zouaghi, Emilien Peytavit, Jean-François Lampin, René Beigang, Joachim Jonuscheit, Georg von Freymann   +10 more
doaj   +1 more source

Spectrally resolved wave-mixing between near- and far-infrared pulses in gas [PDF]

, 2013
We investigate the nonlinear wave-mixing in gases between intense, short optical pulses and long-wavelength fields (mid infrared and terahertz). We show numerically that the beating between the sum- and difference-frequency generation components can be ...
Schmidt, Bruno E., Ozaki, T, Morandotti, R., M Clerici (16177538), Caspani, Lucia, M Shalaby (12138066), Shalaby, M., Vidal, Francois, Ozaki, Tsuneyuki, D Faccio (16177541), B Schmidt (9979535), Clerici, Matteo, Peccianti, M, F Vidal (6971162), Morandotti, Robert, T Ozaki (16177550), Yaakobi, O., Caspani, L, Peccianti, Marco, Schmidt, Bruno E, Shalaby, Mostafa, Marco Peccianti (4464661), Clerici, M, L Caspani (16177544), F Légaré (13690585), Légaré, François, Vidal, F., Morandotti, R, Yaakobi, Oded, O Yaakobi (16177547), Faccio, Daniele, Shalaby, M, Faccio, D, Schmidt, B E, Yaakobi, O, R Morandotti (16168658), Vidal, F, Légaré, F, M Clerici, L Caspani, Ozaki T, Schmidt BE, Morandotti R, R Morandotti, M Shalaby, Faccio D, Yaakobi O, Vidal F, Legare F, D Faccio, M Peccianti, F Légaré, O Yaakobi, Peccianti M, B E Schmidt, Caspani L, T Ozaki, Shalaby M, Clerici M, F Vidal   +59 more
core   +1 more source

Pattern‐Aware Intelligence Enables Nondestructive, Rapid Quantification of High‐Aspect‐Ratio Silicon Etching

Advanced Science, EarlyView.
Pattern‐dependent etching is converted into a physical prior for intelligent reconstruction of high‐aspect‐ratio silicon structures. Combining YOLO‐Pose feature extraction with a topography network, the framework retrieves depth, sidewall angle, and scallop texture from minimal destructive observations, enabling accurate cross‐scale metrology and near ...
Shuyan He, Lang Chen, Bo Wen, Yufeng Jin, Wei Wang   +4 more
wiley   +1 more source

A planar Gunn diode operating above 100 GHz [PDF]

, 2007
We show the experimental realization of a 108-GHz planar Gunn diode structure fabricated in GaAs/AlGaAs. There is a considerable interest in such devices since they lend themselves to integration into millimeter-wave and terahertz integrated circuits ...
Holland, M.C., Stanley, C.R., Pilgrim, N.J., Cumming, D.R.S., Thayne, I.G., Khalid, A.H., Dunn, G.M.   +6 more
core   +1 more source