期刊
NEW JOURNAL OF PHYSICS
卷 23, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/ac03cd
关键词
laser-induced plasma filament; elliptically polarized THz; radially polarized THz
资金
- TERA INFN project
This study investigates the polarization of THz radiation emitted from a one-color laser-induced plasma filament, showing for the first time that both elliptical and radial polarizations are present simultaneously. The results suggest a new route for producing more complex polarization states and THz vortex beams through the electric quadrupole mechanism.
THz-based technologies and research applications have seen a rapid increment in recent period together with the development of novel radiation sources based both on relativistic electrons and laser techniques. In this framework, laser-induced plasma filament plays an important role in generating intense and broadband THz radiation. Although many attentions have been paid to THz emission from two-color plasma filaments, one-color plasma emission has been scarcely investigated. In particular, the polarization state of one-color THz emission is still controversial due to the limitations of the existing THz detection techniques, which are incapable of simultaneously detecting elliptically and radially polarized THz radiation. In this manuscript, we develop a novel detection method and unambiguously demonstrate for the first time that one-color laser-induced plasma filament simultaneously emits elliptically and radially polarized THz radiation. These polarization states suggest that the generation mechanism results from electric quadrupole, showing a new route for producing more complex polarization states and THz vortex beams.
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