High-energy, short-duration bursts of coherent terahertz radiation from an embedded plasma dipole

Kwon, Kyu Been and Kang, Teyoun and Song, Hyung Seon and Kim, Young-Kuk and Ersfeld, Bernhard and Jaroszynski, Dino A. and Hur, Min Sup (2018) High-energy, short-duration bursts of coherent terahertz radiation from an embedded plasma dipole. Scientific Reports, 8. ISSN 2045-2322

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    Abstract

    Emission of radiation from electrons undergoing plasma oscillations (POs) at the plasma frequency has attracted interest because of the existence of intriguing and non-trivial coupling mechanism between the electrostatic PO and the emitted electromagnetic wave. While broadband emission from plasma waves in inhomogeneous plasma is well known, the underlying physics of narrowband emission at the plasma frequency observed in experiments and in solar radio-bursts is obscure. Here we show that a spatially-localized plasma dipole oscillation (PDO) can be generated when electrons are trapped in a moving train of potential wells produced by the ponderomotive force of two slightly detuned laser pulses that collide in plasma and give rise to a burst of quasimonochromatic radiation. The energy radiated in the terahertz spectral region can reach an unprecedented several millijoules, which makes it suitable for applications requiring short pulses of high-intensity, narrowband terahertz radiation.