文献类型：期刊文献

英文题名：Dominance of plasma-induced modulation in terahertz generation from gas filament

作者：Guo, Huicheng[1,2,3];Du, Henglei[1,2,3];Zhan, Qiang[1,2,3,4,5];Zhang, Xiaoxue[1,2,3];Wang, Wenkang[1,2];Liu, Chengpu[1,2,3]

机构：[1]Chinese Acad Sci, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, CAS Ctr Excellence Ultraintense Laser Sci, Shanghai 201800, Peoples R China;[3]Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China;[4]Tongji Univ, Inst Precis Opt Engn, Sch Phys Sci & Engn, China MOE Key Lab Adv Microstruct Mat, Shanghai 200092, Peoples R China;[5]Guangdong Ocean Univ, Phys & Photoelect Sci Dept, Zhanjiang 524088, Peoples R China

年份：2024

卷号：32

期号：3

起止页码：4277

外文期刊名：OPTICS EXPRESS

收录：SCI-EXPANDED(收录号：WOS:001199821600006)、、EI(收录号：20240615495667)、Scopus(收录号：2-s2.0-85183798466)、WOS

基金：Funding. Natural Science Foundation of Shanghai (20ZR1441600) ; National Natural Science Foundation of China (12074398) .

语种：英文

外文关键词：Finite difference time domain method - Laser produced plasmas - Numerical models - Terahertz waves

外文摘要：In this paper, we revisit the fundamental mechanism responsible for terahertz generation from laser-induced plasma filament based on the photocurrent model by employing a blend of analytical calculation and numerical simulation. By using the frequency-decomposed finite-difference time-domain (FD-FDTD) method, the role of two-color field and photocurrent radiation in terahertz generation from plasma filament is visually separated, and the driving effect of photocurrent radiation is confirmed pretty significant within the process. Then, a pair of numerical experiments are taken to further analyze the driving effect of photocurrent radiation, and it is revealed that plasma-induced modulation to photocurrent radiation is actually the underlying physical mechanism of terahertz generation from plasma filament. Furthermore, a three-step diagram is introduced to reillustrate the overall physical process and provides a more comprehensive explanation. In addition, the mechanism of plasma-induced modulation to photocurrent radiation in terahertz generation is substantiated by taking theoretical prediction and numerical simulation of minimal filament length required for achieving stable backward terahertz emission, which directly confirms the validity and significance of plasma-induced modulation to photocurrent radiation in terahertz generation from laser-induced plasma filament.