Gopal, A.A.GopalMay, T.T.MayHerzer, S.S.HerzerReinhard, A.A.ReinhardMinardi, S.S.MinardiSchubert, M.M.SchubertDillner, U.U.DillnerPradarutti, B.B.PradaruttiPolz, J.J.PolzGaumnitz, T.T.GaumnitzKaluza, M.C.M.C.KaluzaJäckel, O.O.JäckelRiehemann, S.S.RiehemannZiegler, W.W.ZieglerGemuend, H.-P.H.-P.GemuendMeyer, H.-G.H.-G.MeyerPaulus, G.G.G.G.Paulus2022-03-042022-03-042012https://publica.fraunhofer.de/handle/publica/22946610.1088/1367-2630/14/8/0830122-s2.0-84865268270We 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.en620530journal article