2020
DOI: 10.1103/physreva.102.023530
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Relativistic terahertz radiation generated by direct-laser-accelerated electrons from laser-foil interactions

Abstract: A scheme for generating powerful terahertz (THz) radiation based on laser-solid interactions is proposed. When a p-polarized femtosecond laser impinges obliquely on a plane solid target and the target partially blocks the laser energy, surface electrons are extracted to the vacuum and accelerated by the laser fields, forming a low-divergence electron beam. A half-cycle THz radiation pulse is emitted simultaneously as the beam passes by the edge of the target, due to a mechanism similar to coherent transition r… Show more

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Cited by 8 publications
(6 citation statements)
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“…To our best knowledge, such half-cycle type (quasi-half-cycle) pulses generated in laser-target interactions were discussed only in numerical simulations or proposed as ad hoc a guess [12,13], while quasi-half-cycle pulses have already been observed in the experiments with electron beams from conventional accelerators [14]. Standardly, theory of transition radiation from electron bunch is presented in the far-field approximation [15][16][17][18] as extension of classical theory for a single electron [19]. There is no corresponding near-field theory, which could be a base for the experimental measurements THz fields near the target surface, where these fields have maximum strength.…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…To our best knowledge, such half-cycle type (quasi-half-cycle) pulses generated in laser-target interactions were discussed only in numerical simulations or proposed as ad hoc a guess [12,13], while quasi-half-cycle pulses have already been observed in the experiments with electron beams from conventional accelerators [14]. Standardly, theory of transition radiation from electron bunch is presented in the far-field approximation [15][16][17][18] as extension of classical theory for a single electron [19]. There is no corresponding near-field theory, which could be a base for the experimental measurements THz fields near the target surface, where these fields have maximum strength.…”
Section: Introductionmentioning
confidence: 99%
“…A sheath plasma expansion model has been developed to describe THz radiation of ∼ 1 THz frequency in the direction perpendicular to the laser pulse propagation direction [1,2,25,26]. Transition radiation of laser heated electrons leaving the target is considered as another typical mechanism of THz generation [15][16][17][18]. For the highly relativistic electron beam this mechanism generates well collimated THz pulses along electron propagation direction.…”
Section: Introductionmentioning
confidence: 99%
“…In order to acquire high-quality electron beams and highenergy THz radiation, schemes utilizing micro-structured targets have been proposed. 3D PIC simulations demonstrate strong electron emission at the micro-scaled target edge, which leads to a THz energy of over 10 mJ with a 1 J pump laser [19]. Another study employs solid foil targets covered with aligned nanorod arrays in experiments; the resulting efficiency is enhanced by an order of magnitude compared to a solid foil target [20].…”
Section: Introductionmentioning
confidence: 99%
“…Frequency up-or downconversion of electromagnetic radiation can be realized through nonlinear wavematter and wave-wave interaction. THz radiation can also be produced in intense laser interaction with matter [3,5,[6][7][8][9][10][11][12][13][14]. T-rays can also be produced by the oscillating electrons in laser-induced wakefields [15][16][17], Smith-Purcell effect of the electron beams in laser-matter interactions [18], two-color laser gas-plasma interaction [19,20], transition-Cherenkov effect from laser filaments [21], laser-driven wire-guided helical undulators [22], and linear and nonlinear mode conversion [23], as well as laser interaction with strongly magnetized plasmas [24][25][26][27].…”
Section: Introductionmentioning
confidence: 99%