Bulletin of the American Physical Society
66th Annual Meeting of the APS Division of Plasma Physics
Monday–Friday, October 7–11, 2024; Atlanta, Georgia
Session JO08: Fundamental Plasma Physics: Reconnection & other topics
2:00 PM–5:00 PM,
Tuesday, October 8, 2024
Hyatt Regency
Room: The Learning Center (Fixed)
Chair: Joseph Olson, University of Wisconsin - Madison
Abstract: JO08.00012 : Enhanced resonant energy absorption of few-cycles laser pulse in disorder medium*
4:12 PM–4:24 PM
Presenter:
Ricky L. K Ang
(Singapore University of Technology and D)
Authors:
Ricky L. K Ang
(Singapore University of Technology and D)
Chun yun Kee
(SINGAPORE UNIVERSITY OF TECHNOLOGY AND DESIGN)
Samra Kanwal
(SINGAPORE UNIVERSITY OF TECHNOLOGY AND DESIGN)
This paper is to study the enhanced energy absorption of few-cycle laser pulses impinging into a porous medium with a doped impurity at a resonant line close to the laser frequency. Analytical reflection R and transmission T coefficients of electromagnetic wave propagation are first derived as a function of 0 < α ≤ 1 to account for the degree of porosity and α = 1 denotes a perfect ideal slab. Calculated values of R and T are verified by a electromagnetic solver by creating an object with randomly generated porosity. Based on a Drude model with resonant line due to impurities, we calculate the resonant energy absorption of a few-cycle laser pulse. The energy absorption efficiency is maximized for a certain degree of doping concentration at a given pulse length and also for a certain pulse length at a given doping concentration. At small doping concentration, the absorption efficiency increases with smaller α (high porosity) and the trend is reversed at larger α (small porosity). Dimensionless parameters are constructed, allowing the calculated results to be applicable over a wide range of frequencies and pulse duration. Thus
this model serves as a useful tool to characterize the amount of energy absorption due to the combined effects of impurity and porosity, which are important for many applications
in physics and engineering.
*This research is supported by Singapore NRF and A*STAR under its Quantum Engineering Programme (NRF2021-QEP2-02-P03).
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