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Observation of energetic terahertz pulses from relativistic solid density plasmas

: Gopal, A.; May, T.; Herzer, S.; Reinhard, A.; Minardi, S.; Schubert, M.; Dillner, U.; Pradarutti, B.; Polz, J.; Gaumnitz, T.; Kaluza, M.C.; Jäckel, O.; Riehemann, S.; Ziegler, W.; Gemuend, H.-P.; Meyer, H.-G.; Paulus, G.G.

Postprint (2.3 MByte; PDF; )

New journal of physics. Online journal 14 (2012), Nr.8, Art. 083012, 12 S.
ISSN: 1367-2630
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()

We report the first experimental observation of terahertz (THz) radiation from the rear surface of a solid target while interacting with an intense laser pulse. Experimental and two-dimensional particle-in-cell simulations show that the observed THz radiation is mostly emitted at large angles to the target normal. Numerical results point out that a large part of the emission originates from a micron-scale plasma sheath at the rear surface of the target, which is also responsible for the ion acceleration. This opens a perspective for the application of THz radiation detection for on-site diagnostics of particle acceleration in laser-produced plasmas.