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Proceedings Paper

Microdisk THz quantum-cascade lasers with super-conducting cavities
Author(s): A. Benz; M. Brandstetter; C. Deutsch; G. Fasching; A. M. Andrews; P. Klang; W. Schrenk; G. Strasser; K. Unterrainer
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Paper Abstract

We present a new waveguide concept for terahertz quantum-cascade laser. The double-metal waveguide confines the active region between two metallic layers. Thereby, a modal confinement of almost 100 % is achieved. However, these metal layers are also one of the dominating loss mechanisms. Replacing the conventional metal with a superconductor helps to reduce the total losses. A surface plasmon is formed at the interface between the superconductor and the semiconductor. It can be maintained even for photon energies above the superconducting band gap. In this work we use niobium with a band gap of 2.8 meV to confine the active region of a THz-QCL emitting at 9 meV.

Paper Details

Date Published: 19 August 2010
PDF: 7 pages
Proc. SPIE 7763, Terahertz Emitters, Receivers, and Applications, 776303 (19 August 2010); doi: 10.1117/12.860475
Show Author Affiliations
A. Benz, Technische Univ. Wien (Austria)
M. Brandstetter, Technische Univ. Wien (Austria)
C. Deutsch, Technische Univ. Wien (Austria)
G. Fasching, Technische Univ. Wien (Austria)
A. M. Andrews, Technische Univ. Wien (Austria)
P. Klang, Technische Univ. Wien (Austria)
W. Schrenk, Technische Univ. Wien (Austria)
G. Strasser, Technische Univ. Wien (Austria)
K. Unterrainer, Technische Univ. Wien (Austria)

Published in SPIE Proceedings Vol. 7763:
Terahertz Emitters, Receivers, and Applications
Jean-François Lampin; Didier J. Decoster; Manijeh Razeghi, Editor(s)

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