AI Article Synopsis
- Electrons in plasma can emit radiation during oscillations at a specific frequency, leading to interesting interactions between electrostatic waves and emitted electromagnetic waves.
- Despite known broadband emissions in non-uniform plasma, the reasons behind the narrowband emissions, like those seen in solar bursts, remain unclear.
- This study explains how localized oscillations can be created by trapping electrons with colliding laser pulses, resulting in powerful bursts of terahertz radiation ideal for high-intensity applications.
Article 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 quasi-monochromatic 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.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5760715 | PMC |
| http://dx.doi.org/10.1038/s41598-017-18399-3 | DOI Listing |
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