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- ItemFigures of merit of thermoelectric and bolometric thermal radiation sensors(Göttingen : Copernicus, 2013) Dillner, U.; Kessler, E.; Meyer, H.-G.Figures of merit condensing the performance parameters of radiation sensors such as responsivity, noise equivalent power, and time constant in a single number can be useful for rating the performance of a particular sensor in comparison to other ones or to fundamental performance limits. The classification system and the figures of merit of radiation sensors introduced by R. C. Jones are revisited for thermal radiation sensors with the focus on thermopiles and bolometers. As a result it is stated that radiation thermopiles and bolometers should be classified differently: type III detectors for thermopiles vs. type II detectors for bolometers. Modified figures of merit are suggested and relations between them given. The figures of merit are applied in an overview on state-of-the-art thermopiles and bolometers operated at room temperature.
- ItemObservation of energetic terahertz pulses from relativistic solid density plasmas(Bristol : IOP, 2012) 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.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.