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19 August 2010 Microdisk THz quantum-cascade lasers with super-conducting cavities
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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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Benz, M. Brandstetter, C. Deutsch, G. Fasching, A. M. Andrews, P. Klang, W. Schrenk, G. Strasser, and K. Unterrainer "Microdisk THz quantum-cascade lasers with super-conducting cavities", Proc. SPIE 7763, Terahertz Emitters, Receivers, and Applications, 776303 (19 August 2010);


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