title: Ultrawide electrical tuning of light matter interaction in a high electron mobility transistor structure.
abstract: The interaction between intersubband resonances (ISRs) and metamaterial microcavities constitutes a strongly coupled system where new resonances form that depend on the coupling strength. Here we present experimental evidence of strong coupling between the cavity resonance of a terahertz metamaterial and the ISR in a high electron mobility transistor (HEMT) structure. The device is electrically switched from an uncoupled to a strongly coupled regime by tuning the ISR with epitaxially grown transparent gate. The asymmetric potential in the HEMT structure enables ultrawide electrical tuning of ISR, which is an order of magnitude higher as compared to an equivalent square well. For a single heterojunction with a triangular confinement, we achieve an avoided splitting of 0.52 THz, which is a significant fraction of the bare intersubband resonance at 2 THz.
authors.affiliation: Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany.|AG Terahertz Spektroskopie und Technologie, Ruhr-Universität Bochum, D-44780 Bochum, Germany.
authors.forename: Shovon
authors.initials: S
authors.lastname: Pal
authors.affiliation: AG Terahertz Spektroskopie und Technologie, Ruhr-Universität Bochum, D-44780 Bochum, Germany.
authors.forename: Hanond
authors.initials: H
authors.lastname: Nong
authors.affiliation: Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany.|AG Terahertz Spektroskopie und Technologie, Ruhr-Universität Bochum, D-44780 Bochum, Germany.
authors.forename: Sergej
authors.initials: S
authors.lastname: Markmann
authors.affiliation: Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany.
authors.forename: Nadezhda
authors.initials: N
authors.lastname: Kukharchyk
authors.affiliation: Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany.
authors.forename: Sascha R
authors.initials: SR
authors.lastname: Valentin
authors.affiliation: Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany.
authors.forename: Sven
authors.initials: S
authors.lastname: Scholz
authors.affiliation: Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany.
authors.forename: Arne
authors.initials: A
authors.lastname: Ludwig
authors.affiliation: Lehrstuhl für Werkstoffe und Nanoelektronik, Ruhr-Universität Bochum, D-44780 Bochum, Germany.
authors.forename: Claudia
authors.initials: C
authors.lastname: Bock
authors.affiliation: Lehrstuhl für Werkstoffe und Nanoelektronik, Ruhr-Universität Bochum, D-44780 Bochum, Germany.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Kunze
authors.affiliation: Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany.
authors.forename: Andreas D
authors.initials: AD
authors.lastname: Wieck
authors.affiliation: AG Terahertz Spektroskopie und Technologie, Ruhr-Universität Bochum, D-44780 Bochum, Germany.
authors.forename: Nathan
authors.initials: N
authors.lastname: Jukam