Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 32: Postersession Superconductivity: Josephson Junctions, SQUIDs, Heterostructures, Andreev Scattering, Vortex Physics, Cryodetectors, Measuring Devices, Cryotechnique
TT 32.29: Poster
Mittwoch, 25. März 2009, 14:00–18:00, P1A
Superconducting NbN detectors for synchrotron radiation — Alexei Semenov1, Konstantin Il'in2, Michael Siegel2, •Heiko Richter1, and Heinz-Wilhelm Hübers1 — 1DLR Instiute of Planetary Research, 12489 Berlin — 2Instutute of Micro- and Nanoelectronic Systems, University of Karlsruhe
We present development of a special type of hot-electron bolometers that is designed to optimally detect pulsed synchrotron radiation in the terahertz frequency range. The enlarged log-spiral antenna makes it possible to sense the low-frequency part of the spectrum in coherent and non-coherent regime. The device follows the layout of a typical HEB mixer. The radiation is coupled quasioptically with the 6-mm elliptical silicon lens. The bolometer has the noise equivalent power 2 nW per square root Hz and responds to a few picoseconds long radiation pulse with the electric pulse having full width at half maximum of 160 ps. We present results obtained with this type of detector at different synchrotron facilities and discuss possible improvements of the detector performance.