Results 11 to 20 of about 36,720 (261)

Subwavelength Diffractive Optical Elements for Generation of Terahertz Coherent Beams with Pre-Given Polarization State

Sensors, 2023
Coherent terahertz beams with radial polarization of the 1st, 2nd, and 3rd orders have been generated with the use of silicon subwavelength diffractive optical elements (DOEs).
Vladimir Pavelyev, Svetlana Khonina, Sergey Degtyarev, Konstantin Tukmakov, Anton Reshetnikov, Vasily Gerasimov, Natalya Osintseva, Boris Knyazev   +7 more
doaj   +1 more source

Photonic quasi-crystal terahertz lasers [PDF]

Nature Communications, 2014
AbstractQuasi-crystal structures do not present a full spatial periodicity but are nevertheless constructed starting from deterministic generation rules. When made of different dielectric materials, they often possess fascinating optical properties, which lie between those of periodic photonic crystals and those of a random arrangement of scatterers ...
Vitiello Miriam Serena, Nobile Michele, Ronzani Alberto, Tredicucci Alessandro, Castellano Fabrizio, Talora Valerio, Li Lianhe, Linfield Edmund H, Davies A Giles   +8 more
openaire   +3 more sources

Graphene-controlled Terahertz Plasmonic Laser [PDF]

CLEO: 2013 Postdeadline, 2013
For the first time, we demonstrate that monolayer graphene can control surface-plasmon modes in terahertz lasers. Integrating a graphene-coated, multi-band filter, varied in situ by electrochemical gating, individual modes can be switched on and off. © 2013 OSA.
Chakraborty, S., Marshall, O. P., Kim, Y. J., Novoselov, K. S., Beere, H. E., Ritchie, D. A.   +5 more
openaire   +2 more sources

Strong polarization-controlled terahertz generation by bi-elliptical polarized laser fields

Frontiers in Physics, 2023
Terahertz generation from atoms driven by two color linearly polarized (LP) and circularly polarized (CP) laser fields have been well investigated. In this work, based on the photocurrent model, we investigate theoretically the intensity and polarization
Yan-Mei Liu, Ya-Ning Li, Lei Zhang, Zhi-Hong Jiao, Song-Feng Zhao, Guo-Li Wang   +5 more
doaj   +1 more source

Superhydrophobic polytetrafluoroethylene surfaces with accurately and continuously tunable water adhesion fabricated by picosecond laser direct ablation

Materials & Design, 2019
Superhydrophobic polytetrafluoroethylene (PTFE) surfaces with accurately and continuously tunable water adhesion were fabricated by a simple and rapid method of picosecond (ps) laser direct ablation.
Zhongli Qin, Jun Ai, Qifeng Du, Jianguo Liu, Xiaoyan Zeng   +4 more
doaj   +1 more source

Ultrafast control of polarization of terahertz generation from laser–gas interaction using orthogonal few-cycle double-pulse lasers [PDF]

AIP Advances
The effect of orthogonal few-cycle double-pulse laser parameters on the terahertz polarization states generated from laser-driven gas plasma is investigated.
Xue Liu, Jin-Xu Du, Lei Zhang, Zhi-Hong Jiao, Song-Feng Zhao, Guo-Li Wang   +5 more
doaj   +1 more source

Laser Processing of Transparent Wafers with a AlGaN/GaN Heterostructures and High-Electron Mobility Devices on a Backside

Micromachines, 2021
Sapphire and silicon carbide substrates are used for growth of the III-N group heterostructures to obtain the electronic devices for high power and high frequency applications.
Simonas Indrišiūnas, Evaldas Svirplys, Justinas Jorudas, Irmantas Kašalynas   +3 more
doaj   +1 more source

Analysis of a narrowband terahertz signal generated by a unitravelling carrier photodiode coupled with a dual-mode semiconductor Fabry–Pérot laser [PDF]

, 2010
A narrowband terahertz signal generated by a unitravelling carrier photodiode (UTC-PD) interfaced with a dual-mode Fabry–Pérot laser diode is demonstrated.
Akalin, Tahsin, Beck, Alexandre, Ducournau, Guillaume, Lampin, Jean-François, Landais, Pascal, Latkowski, Sylwester, Maldonado-Basilio, Ramón, Parra-Cetina, Josué, Peytavit, Emilien   +8 more
core   +2 more sources

Vertical Cavity Surface Emitting Terahertz Laser [PDF]

Physical Review Letters, 2012
Vertical cavity surface emitting terahertz lasers can be realized in conventional semiconductor microcavities with embedded quantum wells in the strong coupling regime. The cavity is to be pumped optically at half the frequency of the 2p exciton state.
Kavokin, A.V., Shelykh, I.A., Taylor, T., Glazov, M.M.   +3 more
openaire   +5 more sources

Electrical and radiation characteristics of semilarge photoconductive terahertz emitters [PDF]

, 2004
We present experimental characterization of semilarge photoconductive emitters, including their electrical/photoconductive parameters and terahertz spectra. A range of emitters were studied and fabricated on both LT-GaAs and SI-GaAs, having a variety
Fletcher, J.R., Miles, R.E., Naftaly, M., Steenson, D.P., Stone, M.R.   +4 more
core   +1 more source