Speaker
Description
Plasma is a promising medium for generating high-power terahertz (THz) pulses, as it can be driven by extremely intense laser fields without suffering permanent damage. Numerous approaches have been proposed to convert the energy of a driving laser pulse into THz radiation using plasma as the conversion medium. The schemes such as coherent transition radiation (CTR) or two-color method, where transient nature of electron currents are the mechanism, produce broadband THz pulses. On the other hand, more long-lasting plasma oscillation can be exploited for generation of narrowband THz waves. However, this latter approach has difficulty in achieving efficient coupling between the electrostatic plasma oscillation and the electromagnetic THz radiation. Recentaly we proposed a couple of methods to generate a localized plasma oscillators; a plasma dipole oscillation (PDO) [1], and radial plasma oscillator (RPO) [2]. The key aspects of those novel methods are in localizing the spatial region of the plasma oscillation, using colliding two detuned pulses (for PDO) or local resonant excitation of the plasma by colinear detuned pulses (for RPO). In this presentation, the main ideas and simulation results are introduced. In particular, the simulation of electron acceleration by radially polarized THz wave is introduced.
[1] K.B. Kwon et al., Sci. Rep. 8, 145 (2018).
[2] M. Kumar et al., Phys. Rev. Lett. 134, 015001 (2025).
| Working group | WG1 |
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