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Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 11: Poster Session: Matter at Low Temperature

TT 11.7: Poster

Montag, 14. März 2011, 14:00–18:00, P4

Coherent broadband continuous-wave THz spectrometry at low temperaturesJennifer Marx1, •Ernesto Uldarico Vidal1, Komalavalli Thirunavukkuarasu1, Holger Schmitz1, Axel Roggenbuck2, Anselm Deninger2, Iván Cámara Mayorga3, Rolf Güsten3, Joachim Hemberger1, and Markus Grüninger11II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany — 2TOPTICA Photonics AG, Lochhamer Schlag 19, D-82166 Gräfelfing, Germany — 3Max-Planck-Institute for Radio Astronomy, Auf dem Hügel 69, D-53121 Bonn, Germany

We report on the implementation of a cryostat into a continuous-wave THz spectrometer which uses the principle of mixing the light of two NIR DFB diode lasers at a photomixer for generating THz radiation over a broad range from 60 GHz to 1.3 THz. The THz radiation is detected coherently by a second photomixer. In combination with a fiber stretcher, our compact fiber-based setup allows very reliable determination of both real and imaginary parts of the complex optical functions, eliminating the need for Kramers-Kronig transformation. Furthermore, photocurrent correction can be used to correct for instabilities such as thermal drifts. Here, we present some results on different solid-state samples as an illustration of the capability of the spectrometer in the temperature range from room temperature to 1.5 K.

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