Theoretical investigation of THz radiation generation from air-plasma based on an improved FDTD algorithm

Huicheng Guo; Henglei Du; Chengpu Liu

doi:10.1117/12.2621508

1 July 2022 Theoretical investigation of THz radiation generation from air-plasma based on an improved FDTD algorithm

Huicheng Guo, Henglei Du, Chengpu Liu

Proceedings Volume 12291, 1st International Conference on UltrafastX 2021; 1229109 (2022) https://doi.org/10.1117/12.2621508
Event: 1st International Conference on UltrafastX 2021, 2022, Xi'an, China

Abstract

So far the finite-difference time-domain(FDTD) algorithm is the most effective tool to calculate the Maxwell’s equations directly in time domain. Because of its advantage in describing a specified propagating pulse by considering the phase characteristics, it is essential for the bidirectional investigation of THz radiation generation from micro-air-gas-plasma. However, it shows inconvenience or even impossibility if a general dispersive response of bound electrons within the partially ionized gases is included. Here, an improved FDTD method based on frequency-decomposition(FD) is proposed, and its validity and super-advantage are confirmed by the numerical demonstration of THz radiation generation from ultrafast laser induced gas plasma using a general dispersive response model with coefficients fitted from experimentally measured data in a wide frequency range.

Citation Download Citation

Huicheng Guo, Henglei Du, and Chengpu Liu "Theoretical investigation of THz radiation generation from air-plasma based on an improved FDTD algorithm", Proc. SPIE 12291, 1st International Conference on UltrafastX 2021, 1229109 (1 July 2022); https://doi.org/10.1117/12.2621508

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