期刊
STRUCTURAL DYNAMICS-US
卷 7, 期 6, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/4.0000044
关键词
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资金
- DOE [DE-FG0206ER46309]
- NSF MRI [DMR 1625181]
- Air Force Office of Scientific Research (AFOSR) YIP [FA9550-18-1-0061]
A femtosecond plasma imaging modality based on a new development of ultrafast electron microscope is introduced. We investigated the laser-induced formation of high-temperature electron microplasmas and their subsequent non-equilibrium evolution. Based on a straightforward field imaging principle, we directly retrieve detailed information about the plasma dynamics, including plasma wave structures, particle densities, and temperatures. We discover that directly subjected to a strong magnetic field, the photo-generated microplasmas manifest in novel transient cyclotron echoes and form new wave states across a broad range of field strengths and different laser fluences. Intriguingly, the transient cyclotron waves morph into a higher frequency upper-hybrid wave mode with the dephasing of local cyclotron dynamics. The quantitative real-space characterizations of the non-equilibrium plasma systems demonstrate the feasibilities of a new microscope system in studying the plasma dynamics or transient electric fields with high spatiotemporal resolutions.
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