Intense low-noise terahertz generation by relativistic laser irradiating near-critical-density plasma  

作　　者：张世杰 周维民 银燕 邹德滨 赵娜 谢端 卓红斌 Shijie Zhang;Weimin Zhou;Yan Yin;Debin Zou;Na Zhao;Duan Xie;Hongbin Zhuo(Department of Physics,National University of Defense Technology,Changsha 410073,China;Science and Technology on Plasma Physics Laboratory,Laser Fusion Research Center,China Academy of Engineering Physics(CAEP),Mianyang 621900,China;Center for Advanced Material Diagnostic Technology,Shenzhen Technology University,Shenzhen 518118,China;School of Microelectronics and Physics,Hunan University of Technology and Business,Changsha 410205,China;School of Electronic Information and Electrical Engineering,Changsha University,Changsha 410003,China)

机构地区：[1]Department of Physics,National University of Defense Technology,Changsha 410073,China [2]Science and Technology on Plasma Physics Laboratory,Laser Fusion Research Center,China Academy of Engineering Physics(CAEP),Mianyang 621900,China [3]Center for Advanced Material Diagnostic Technology,Shenzhen Technology University,Shenzhen 518118,China [4]School of Microelectronics and Physics,Hunan University of Technology and Business,Changsha 410205,China [5]School of Electronic Information and Electrical Engineering,Changsha University,Changsha 410003,China

出　　处：《Chinese Physics B》2023年第3期363-369,共7页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.11774430,12075157,11775202,and 12175310);the Scientific Research Foundation of Hunan Provincial Education Department(Grant No.20A042).

摘　　要：Low-noise terahertz(THz)radiation over 100 MV/cm generation by a linearly-polarized relativistic laser pulse interacting with a near-critical-density(NCD)plasma slab is studied by theory and particle-in-cell(PIC)simulations.A theoretical model is established to examine the dipole-like radiation emission.The THz radiation is attributed to the singlecycle low-frequency surface current,which is longitudinally constrained by the quasi-equilibrium established by the laser ponderomotive force and the ponderomotively induced electrostatic force.Through theoretical analysis,the spatiotemporal characteristics,polarization property of the THz radiation,and the relation between the radiation strength with the initial parameters of driving laser and plasma are obtained,which are in good consistence with the PIC simulation results.Furthermore,it is found by PIC simulations that the generation of thermal electrons can be suppressed within the appropriate parameter regime,resulting in a clear THz radiation waveform.The appropriate parameter region is given for generating a low-noise intense THz radiation with peak strength reaching 100 MV/cm,which could find potential applications in nonlinear THz physics.

关 键 词：intense terahertz radiation relativistic laser–plasma interactions particle-in-cell simulation 

分 类 号：O53[理学—等离子体物理] O441.4[理学—物理]