Results 41 to 50 of about 36,061 (262)

Field-resolved high-order sub-cycle nonlinearities in a terahertz semiconductor laser

Light: Science & Applications, 2021
Two-dimensional terahertz strong-field spectroscopy reveals wave-mixing processes up to eighth order in a free-running quantum cascade laser, unraveling its sub-cycle gain dynamics and nonlinearities in a regime of negative absorption.
J. Riepl, J. Raab, P. Abajyan, H. Nong, J. R. Freeman, L. H. Li, E. H. Linfield, A. G. Davies, A. Wacker, T. Albes, C. Jirauschek, C. Lange, S. S. Dhillon, R. Huber   +13 more
doaj   +1 more source

Subwavelength micropillar array terahertz lasers

Optics Express, 2014
We report on micropillar-based terahertz lasers with active pillars that are much smaller than the emission wavelength. These micropillar array lasers correspond to scaled-down band-edge photonic crystal lasers forming an active photonic metamaterial.
Michael, Krall, Martin, Brandstetter, Christoph, Deutsch, Hermann, Detz, Aaron Maxwell, Andrews, Werner, Schrenk, Gottfried, Strasser, Karl, Unterrainer   +7 more
openaire   +2 more sources

Kinetics of spin coherence of electrons in $n$-type InAs quantum wells under intense terahertz laser fields

, 2008
Spin kinetics in $n$-type InAs quantum wells under intense terahertz laser fields is investigated by developing fully microscopic kinetic spin Bloch equations via the Floquet-Markov theory and the nonequilibrium Green's function approach, with all the ...
C. W. Gardiner, F. Meier, H. Haug, J. Fabian, J. H. Jiang, M. M. Glazov, M. M. Glazov, M. W. Wu, M. W. Wu, S. D. Ganichev, Y. A. Bychkov, Y. Zhou, Y. Zhou   +12 more
core   +1 more source

Strong Anisotropy in Liquid Water upon Librational Excitation using Terahertz Laser Fields

, 2020
Tracking the excitation of water molecules in the homogeneous liquid is challenging due to the ultrafast dissipation of rotational excitation energy through the hydrogen-bonded network.
Adams, Ellen M., Bennett, Kochise C., Colchero, Alejandro, Havenith, Martina, Head-Gordon, Teresa, Hoberg, Claudius, Novelli, Fabio, Ockelmann, Thorsten, Pestana, Luis Ruiz, Ruiz Pestana, Luis, Schwaab, Gerhard, Sebastiani, Federico, Stavrias, Nikolas   +12 more
core   +1 more source

Broadband terahertz wave generation from an epsilon-near-zero material

Light: Science & Applications, 2021
Terahertz radiation: thin film enhancement A new method for generating terahertz waves exploits the low-permittivity properties of an ultrathin film.
Wenhe Jia, Meng Liu, Yongchang Lu, Xi Feng, Qingwei Wang, Xueqian Zhang, Yibo Ni, Futai Hu, Mali Gong, Xinlong Xu, Yuanyuan Huang, Weili Zhang, Yuanmu Yang, Jiaguang Han   +13 more
doaj   +1 more source

Directivity Control of Terahertz Radiation from Single-Color Filament Plasma with Polypropylene Pipe

Photonics, 2023
Two-dimensional angular distribution of terahertz emission from single-color filamentation of laser pulses is experimentally studied. The use of a polypropylene pipe makes it possible to transform the angular pattern of terahertz radiation from the ...
Daria Mokrousova, Leonid Seleznev, Dmitrii Pushkarev, Georgy Rizaev, Maximilian Levus, Andrey Koribut, Yakov Grudtsyn   +6 more
doaj   +1 more source

PROSPECTS OF THE USE OF GRADIENT GRATES IN THE LASERS OF TERAHERTZ RANGE [PDF]

Radio Physics and Radio Astronomy, 2018
Purpose: The improvement and development of terahertz radiation sources is required for the further development of the terahertz frequency range. Submillimeter lasers are one of the few sources of terahertz radiation.
M. I. Dzyubenko, V. A. Maslov, E. N. Odarenko, V. P. Radionov   +3 more
doaj   +1 more source

Laser‐Driven Strong‐Field Terahertz Sources

Advanced Optical Materials, 2019
AbstractA review on the recent development of intense laser‐driven terahertz (THz) sources is provided here. The technologies discussed include various types of sources based on optical rectification (OR), spintronic emitters, and laser‐filament‐induced plasma. The emphasis is on OR using pump pulses with tilted intensity front.
Fülöp, József András, Tzortzakis, Stelios, Kampfrath, Tobias   +2 more
openaire   +3 more sources

Real-Time 0.89 THz Terahertz Imaging with High-Electron-Mobility Transistor Detector and Hydrogen Cyanide Laser for Non-Destructive Nut Detection

Micromachines
We present a method for real-time terahertz imaging that employs a hydrogen cyanide (HCN) laser as a terahertz source at 0.89 THz and an AlGaN/GaN high-electron-mobility transistor (HEMT) terahertz detector as a camera.
Nu Zhang, Haiqing Liu, Huihui Yan, Hongbei Wang, Jiaxing Xie, Yinxian Jie, Damao Yao   +6 more
doaj   +1 more source

Design concepts of terahertz quantum cascade lasers: Proposal for terahertz laser efficiency improvements

Applied Physics Letters, 2010
Conceptual disadvantages of typical resonant phonon terahertz quantum cascade lasers (THz-QCLs) are analyzed. Alternative designs and their combination within a concrete device proposal are discussed to improve the QCL performance. The improvements are (1) indirect pumping of the upper laser level, (2) diagonal optical transitions, (3) complete ...
Kubis, Tillmann, Mehrotra, Saumitra Raj, Klimeck, Gerhard   +2 more
openaire   +3 more sources