title: Broadly tunable monolithic room-temperature terahertz quantum cascade laser sources.
abstract: Electrically pumped room-temperature semiconductor sources of tunable terahertz radiation in 1-5 THz spectral range are highly desired to enable compact instrumentation for THz sensing and spectroscopy. Quantum cascade lasers with intra-cavity difference-frequency generation are currently the only room-temperature electrically pumped semiconductor sources that can operate in the entire 1-5 THz spectral range. Here we demonstrate that this technology is suitable to implementing monolithic room-temperature terahertz tuners with broadband electrical control of the emission frequency. Experimentally, we demonstrate ridge waveguide devices electrically tunable between 3.44 and 4.02 THz.
authors.affiliation: Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: Seungyong
authors.initials: S
authors.lastname: Jung
authors.affiliation: Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: Aiting
authors.initials: A
authors.lastname: Jiang
authors.affiliation: Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: Yifan
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: Karun
authors.initials: K
authors.lastname: Vijayraghavan
authors.affiliation: Adtech Optics, Inc., 18007 Cortney Court, City of Industry, California 91748, USA.
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Wang
authors.affiliation: Adtech Optics, Inc., 18007 Cortney Court, City of Industry, California 91748, USA.
authors.forename: Mariano
authors.initials: M
authors.lastname: Troccoli
authors.affiliation: Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: Mikhail A
authors.initials: MA
authors.lastname: Belkin