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Proceedings Paper

High performance THz quantum cascade laser with different optical waveguide configurations
Author(s): Miriam Serena Vitiello; Gaetano Scamarcio; Vincenzo Spagnolo; Jesse Alton; Stefano Barbieri; Sukhdeep Dhillon; Carlo Sirtori; Harvey E. Beere; David A. Ritchie
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Paper Abstract

We report on the fabrication of THz quantum cascade lasers (QCLs) based on different optical waveguide configurations and compare the thermal properties of THz devices fabricated with metal-metal optical waveguides based on Au/Au or In/Au wafer bonding. In particular, we show how the careful choice of the metal sequence used for the reactive bonding may lead to a considerable improvement of the device thermal performance. This information was obtained from the analysis of microprobe band-to-band photoluminescence spectra measured on devices operating in continuous wave (cw). The experimental normalized thermal resistances (RL*), show that the use of Au/Au wafer bonding optimizes the heat dissipation. An extensive comparison with a set of surface-plasmon based THz QCLs, demonstrate that the use of metal-metal wafer bonding can allow cw operation at progressively higher temperatures. Finally, we present the experimental results obtained on a bound-to-continuum QCLs (2.84 THz) emitting 77 mW peak power at 4K, fabricated from an MBE wafers acquired by a commercial provider.

Paper Details

Date Published: 21 February 2007
PDF: 9 pages
Proc. SPIE 6479, Quantum Sensing and Nanophotonic Devices IV, 647917 (21 February 2007); doi: 10.1117/12.717767
Show Author Affiliations
Miriam Serena Vitiello, INFM, Univ. degli Studi di Bari (Italy)
Gaetano Scamarcio, INFM, Univ. degli Studi di Bari (Italy)
Vincenzo Spagnolo, Politecnico di Bari (Italy)
Jesse Alton, TeraView Ltd. (United Kingdom)
Univ. of Cambridge (United Kingdom)
Stefano Barbieri, TeraView Ltd. (United Kingdom)
Matériaux et Phénomènes Quantique Lab., Univ. Paris VII (France)
Sukhdeep Dhillon, Matériaux et Phénomènes Quantique Lab., Univ. Paris VII (France)
Carlo Sirtori, Matériaux et Phénomènes Quantique Lab., Univ. Paris VII (France)
Harvey E. Beere, Univ. of Cambridge (United Kingdom)
David A. Ritchie, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 6479:
Quantum Sensing and Nanophotonic Devices IV
Manijeh Razeghi; Gail J. Brown, Editor(s)

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