ACTA

Broad Band THz Sensing by 2DEG Bow-Tie-Type Diodes

G. Valušis^a,c, D. Seliuta^a, V. Tamošiūnas^a, E. Širmulis^a, S. Balakauskas^a, J. Gradauskas^a, A. Sužiedėlis^a, S. Ašmontas^a, T. Anbinderis^b, A. Narkūnas^b, I. Papsujeva^b, A. Lisauskas^c, H.G. Roskos^c and K. Köhler^d
^aSemiconductor Physics Institute, A. Goštauto 11, 01108 Vilnius, Lithuania
^bElmika Ltd, Naugarduko 41, 03227 Vilnius, Lithuania
^cPhysikalisches Institut der J.W. Goethe-Universität, 60054 Frankfurt/M, Germany
^dFraunhofer-Institut für Angewandte Festkörperphysik, 79108 Freiburg, Germany

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Received: 22 08 2004;

We suggest a novel approach to detect broad band, 0.078-2.52 THz, electromagnetic radiation at room temperature using an asymmetrically-shaped bow-tie diode based on a modulation-doped GaAs/AlGaAs structure. We show that the voltage sensitivity in the range from 0.078 THz up to 0.8 THz has a plateau and its value is within 0.3-0.5 V/W. We consider the bow-tie diode design to increase the sensitivity of the device.

DOI: 10.12693/APhysPolA.107.184
PACS numbers:73.50.-h, 85.30.De, 72.30.+q