Results 41 to 50 of about 11,957 (302)

Optical Terahertz Sources Based on Difference Frequency Generation in Nonlinear Crystals

Crystals, 2022
Terahertz (THz) sources, ranging from 0.1 THz to 10 THz, between microwaves and infrared waves, have important applications in spectral detection, medical imaging, communication, etc.
Yang Liu, Kai Zhong, Aiqiang Wang, Mengchen Zhou, Shanchuang Li, Lu Gao, Ze Zhang   +6 more
doaj   +1 more source

Enhanced terahertz third-harmonic generation by bound states in the continuum in graphene grating-like metamaterial

Frontiers in Physics, 2023
Non-linear metamaterials hold great promise for enhanced terahertz harmonic generation. Here, we numerically investigate enhanced terahertz third-harmonic generation (THG) by exploiting the symmetry-protected bound states in the continuum (BICs) in ...
Baoku Wang, Jing Liu, Jinhui Cui, Jialin Liu, Fengjun Tian, Weimin Sun, Li Li, Li Li   +7 more
doaj   +1 more source

High resolution waveguide terahertz time-domain spectroscopy

, 2022
S.1267-1284Terahertz time-domain spectroscopy accesses the frequency range between 100 GHz and 5 THz by using the coherent generation and detection based on femtosecond laser sources.
Melinger, J.S., Theuer, M.
core   +1 more source

Generation of terahertz radiation by AlGaAs nanowires [PDF]

JETP Letters, 2015
Terahertz emission by AlGaAs nanowires grown on a GaAs substrate under excitation by femtosecond optical pulses has been observed. It is demonstrated that THz emission occurs via excitation of photocurrent in the nanowires. The dynamics of photoinduced charge carriers is studied via the influence of an electron—hole plasma on terahertz radiation. It is
Trukhin, V.N., Buyskih, A.S., Bouravlev, A.D., Mustafa, I.A., Samsonenko, Yu. B., Trukhin, A.V., Cirlin, G.E., Kaliteevski, M.A., Zeze, D.A., Gallant, A.J.   +9 more
openaire   +2 more sources

A Chirped Characteristic-Tunable Terahertz Source for Terahertz Sensing

Sensors
In broadband terahertz waves generated by femtosecond lasers, spatial chirp will be simultaneously produced with the introduction of angular dispersion.
Feilong Gao, Mingzhe Jiang, Shaodong Hou
doaj   +1 more source

Generation of Terahertz Radiation by Two-Color Ionizing Laser Pulses with Arbitrary Intensity Ratios

Photonics, 2020
The dependence of the terahertz energy generated by two-color femtosecond ionizing pulses on intensities of both one-color components is studied. The numerical calculations are supported with analytical formulas which help to reveal the nature of these ...
Ivan Laryushin
doaj   +1 more source

Intra-pulse difference frequency generation in ZnGeP2 for high-frequency terahertz radiation generation

Scientific Reports, 2023
The highly-nonlinear chalcopyrite crystal family has experienced remarkable success as source crystals in the mid-infrared spectral range, such that these crystals are primary candidates for producing high terahertz frequency (i.e., $$\gtrsim$$ ≳ 10 THz)
B. N. Carnio, M. Zhang, K. T. Zawilski, P. G. Schunemann, O. Moutanabbir, A. Y. Elezzabi   +5 more
doaj   +1 more source

Plasmonic Terahertz Amplification in Graphene-Based Asymmetric Hyperbolic Metamaterial

Photonics, 2015
We propose and theoretically explore terahertz amplification, based on stimulated generation of plasmons in graphene asymmetric hyperbolic metamaterials (AHMM), strongly coupled to terahertz radiation.
Igor Nefedov, Leonid Melnikov
doaj   +1 more source

Sub‐terahertz and terahertz generation in long‐wavelength quantum cascade lasers [PDF]

Nanophotonics, 2018
Abstract Terahertz quantum cascade laser sources with intra‐cavity non‐linear frequency mixing are the first room‐temperature electrically pumped monolithic semiconductor sources that operate in the 1.2–5.9 THz spectral range. However, high performance in low‐frequency range is difficult because converted terahertz waves suffer from ...
Kazuue Fujita, Shohei Hayashi, Akio Ito, Masahiro Hitaka, Tatsuo Dougakiuchi   +4 more
openaire   +2 more sources

Current Status and Challenges in Data Collection for Aerospace Coatings Deposited by Plasma Spraying

Advanced Engineering Materials, EarlyView.
An innovative approach has been integrated into the GRENAT project to optimize plasma spraying and coating performance. Raw materials are accelerated and melted in the plasma generated by torches, creating coatings. Monitoring sensors collect process data which are combined with ex situ characterization data.
Lila Randriamananjara, Vincent Rat, Quentin Dubreuil, Patrice Valorge, Simon Goutier, Alain Denoirjean, Olivier Messe, Céline Ruelle, Jean‐Philippe Poli   +8 more
wiley   +1 more source