title: Resonant metamaterial detectors based on THz quantum-cascade structures.
abstract: We present the design, fabrication and characterisation of an intersubband detector employing a resonant metamaterial coupling structure. The semiconductor heterostructure relies on a conventional THz quantum-cascade laser design and is operated at zero bias for the detector operation. The same active region can be used to generate or detect light depending on the bias conditions and the vertical confinement. The metamaterial is processed directly into the top metal contact and is used to couple normal incidence radiation resonantly to the intersubband transitions. The device is capable of detecting light below and above the reststrahlenband of gallium-arsenide corresponding to the mid-infrared and THz spectral region.
authors.affiliation: Photonics Institute and Centre for Micro- and Nanostructures, Vienna University of Technology, Gusshausstrasse 29/387, A-1040 Vienna, Austria.
authors.forename: A
authors.initials: A
authors.lastname: Benz
authors.affiliation: Photonics Institute and Centre for Micro- and Nanostructures, Vienna University of Technology, Gusshausstrasse 29/387, A-1040 Vienna, Austria.
authors.forename: M
authors.initials: M
authors.lastname: Krall
authors.affiliation: Photonics Institute and Centre for Micro- and Nanostructures, Vienna University of Technology, Gusshausstrasse 29/387, A-1040 Vienna, Austria.
authors.forename: S
authors.initials: S
authors.lastname: Schwarz
authors.affiliation: Photonics Institute and Centre for Micro- and Nanostructures, Vienna University of Technology, Gusshausstrasse 29/387, A-1040 Vienna, Austria.
authors.forename: D
authors.initials: D
authors.lastname: Dietze
authors.affiliation: Institute of Solid-State Electronics and Centre for Micro- and Nanostructures, Vienna University of Technology, Floragasse 7/362, A-1040 Vienna, Austria.
authors.forename: H
authors.initials: H
authors.lastname: Detz
authors.affiliation: Institute of Solid-State Electronics and Centre for Micro- and Nanostructures, Vienna University of Technology, Floragasse 7/362, A-1040 Vienna, Austria.
authors.forename: A M
authors.initials: AM
authors.lastname: Andrews
authors.affiliation: Institute of Solid-State Electronics and Centre for Micro- and Nanostructures, Vienna University of Technology, Floragasse 7/362, A-1040 Vienna, Austria.
authors.forename: W
authors.initials: W
authors.lastname: Schrenk
authors.affiliation: Institute of Solid-State Electronics and Centre for Micro- and Nanostructures, Vienna University of Technology, Floragasse 7/362, A-1040 Vienna, Austria.
authors.forename: G
authors.initials: G
authors.lastname: Strasser
authors.affiliation: Photonics Institute and Centre for Micro- and Nanostructures, Vienna University of Technology, Gusshausstrasse 29/387, A-1040 Vienna, Austria.
authors.forename: K
authors.initials: K
authors.lastname: Unterrainer