Show simple item record

dc.contributor.authorWang, Honggeng
dc.contributor.authorShangguan, Huangcheng
dc.contributor.authorSong, Qiying
dc.contributor.authorCai, Yi
dc.contributor.authorLin, Qinggang
dc.contributor.authorLu, Xiaowei
dc.contributor.authorWang, Zhanxin
dc.contributor.authorZheng, Shuiqin
dc.contributor.authorXu, Shixiang
dc.date.accessioned2021-01-13T11:56:57Z
dc.date.available2021-01-13T11:56:57Z
dc.date.issued2021-01-05
dc.date.submitted2020-10-28
dc.identifier.citationWang, H., Shangguan, H., Song, Q., Cai, Y., Lin, Q., Lu, X., … Xu, S. (2021). Generation and evolution of different terahertz singular beams from long gas-plasma filaments. Optics Express, 29(2), 996. doi:10.1364/oe.413483
dc.identifier.issn1094-4087
dc.identifier.doi10.1364/oe.413483
dc.identifier.urihttp://hdl.handle.net/10754/666888
dc.description.abstractWe theoretically and numerically investigate the generation and evolution of different pulsed terahertz (THz) singular beams with an ultrabroad bandwidth (0.1–40 THz) in long gas-plasma filaments induced by a shaped two-color laser field, i.e., a vortex fundamental pulse (ω0) and a Gaussian second harmonic pulse (2ω0). Based on the unidirectional propagation model under group-velocity moving reference frame, the simulating results demonstrate that three different THz singular beams, including the THz necklace beams with a π-stepwise phase profile, the THz angular accelerating vortex beams (AAVBs) with nonlinear phase profile, and the THz vortex beams with linear phase profile, are generated. The THz necklace beams are generated first at millimeter-scale length. Then, with the increase of the filament length, THz AAVBs and THz vortex beams appear in turn almost periodically. Our calculations confirm that all these different THz singular beams result from the coherent superposition of the two collinear THz vortex beams with variable relative amplitudes and conjugated topological charges (TCs), i.e., +2 and −2. These two THz vortex beams could come from the two four-wave mixing (FWM) processes, respectively, i.e., ω0+ω0−2ω0→ωTHz and –(ω0+ω0) + 2ω0→ωTHz. The evolution of the different THz singular beams depends on the combined effect of the pump ω0−2ω0 time delay and the separate, periodical, and helical plasma channels. And the TC sign of the generated THz singular beams can be easily controlled by changing the sign of the ω0−2ω0 time delay. We believe that these results will deepen the understanding of the THz singular beam generation mechanism and orbital angular momentum (OAM) conversion in laser induced gas-filamentation.
dc.description.sponsorshipNational Natural Science Foundation of China (61775142, 61827815, 61705132, 9205020004); Shenzhen Fundamental Research and Discipline Layout project (JCYJ20170412105812811, JCYJ20190808164007485, JCYJ20190808121817100, JCYJ20190808115601653); Postgraduate innovation development fund project of Shenzhen University (315-0000470506).
dc.publisherThe Optical Society
dc.relation.urlhttps://www.osapublishing.org/abstract.cfm?URI=oe-29-2-996
dc.rightsOptical Society of America under the terms of the OSA Open Access Publishing Agreement
dc.rights.urihttps://doi.org/10.1364/OA_License_v1#VOR-OA
dc.titleGeneration and evolution of different terahertz singular beams from long gas-plasma filaments
dc.typeArticle
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
dc.contributor.departmentPhotonics Laboratory, Division of Computer, Electrical, and Mathematical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
dc.identifier.journalOptics Express
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionShenzhen Key Laboratory of Micro-Nano Photonic Information Technology, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, Guangdong 518060, China.
dc.contributor.institutionKey Laboratory of Optoelectronic Devices and Systems and Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, Guangdong 518060, China.
dc.contributor.institutionSchool of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou Jiangsu 201800, China.
dc.identifier.volume29
dc.identifier.issue2
dc.identifier.pages996
kaust.personZheng, Shuiqin
dc.date.accepted2020-12-09
refterms.dateFOA2021-01-13T11:57:33Z


Files in this item

Thumbnail
Name:
oe-29-2-996.pdf
Size:
7.382Mb
Format:
PDF
Description:
Published version

This item appears in the following Collection(s)

Show simple item record