World's Best Scientists 2026 revealed!
Karl Unterrainer

Karl Unterrainer

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Electronics and Electrical Engineering
Austria
2026

D-Index & Metrics

Electronics and Electrical Engineering

D-Index
45
Citations
8094
World Ranking
3557
National Ranking
8

Research.com Recognitions

  • 2026 - Research.com Electronics and Electrical Engineering in Austria Leader Award

Overview

Karl Unterrainer is affiliated with TU Wien in Austria and has contributed extensively to several fields of scientific research, primarily focusing on engineering, chemistry, and physics and astronomy. Their work centers on various subfields, including electrical and electronic engineering, spectroscopy, atomic and molecular physics and optics, atmospheric science, and acoustics and ultrasonics.

The main topics of Karl Unterrainer's research cover spectroscopy and laser applications, photonic and optical devices, advanced fiber laser technologies, terahertz technology and applications, atmospheric ozone and climate, random lasers and scattering media, as well as atmospheric and environmental gas dynamics.

They have published scientific papers in a variety of venues, with frequent publications appearing in:

  • Conference on Lasers and Electro-Optics
  • Optics Express
  • 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)
  • Applied Physics Letters
  • Optica

Recent papers authored or coauthored by Karl Unterrainer include:

  • Comb operation in terahertz quantum cascade ring lasers, 2021, Optica
  • Landau level laser, 2021, Nature Photonics
  • Terahertz optical machine learning for object recognition, 2020, APL Photonics
  • Silicon integrated terahertz quantum cascade ring laser frequency comb, 2022, Applied Physics Letters
  • Ultrabroadband Heterogeneous THz Quantum Cascade Laser, 2022, ACS Photonics

Karl Unterrainer has collaborated frequently with a number of coauthors, including Benedikt Limbacher, G. Strasser, A. M. Andrews, J. Darmo, and Michael Jaidl. Their research relationships indicate consistent work alongside specialists in related scientific fields and disciplines.

Best Publications

  • Microcavity-Integrated Graphene Photodetector

    Marco Furchi;Alexander Urich;Andreas Pospischil;Govinda Lilley

  • Quantum cascade lasers: ultrahigh-speed operation, optical wireless communication, narrow linewidth, and far-infrared emission

    F. Capasso;R. Paiella;R. Martini;R. Colombelli

  • Intrinsic response time of graphene photodetectors.

    Alexander Urich;Karl Unterrainer;Thomas F Mueller

  • Few-Cycle THz Emission from Cold Plasma Oscillations

    R. Kersting;K. Unterrainer;G. Strasser;H. F. Kauffmann

  • Inverse Bloch oscillator: Strong terahertz-photocurrent resonances at the Bloch frequency.

    K. Unterrainer;B. J. Keay;M. C. Wanke;S. J. Allen

  • Imaging with a Terahertz quantum cascade laser.

    Juraj Darmo;Vincas Tamosiunas;Gernot Fasching;Josef Kröll

  • Terahertz emission from GaAs and InAs in a magnetic field

    James Heyman;P Neocleous;D Hebert;P.A. Crowell

  • Terahertz phase modulator

    R. Kersting;G. Strasser;K. Unterrainer

  • Quantum cascade lasers with double metal-semiconductor waveguide resonators

    Karl Unterrainer;Raffaele Colombelli;Claire F. Gmachl;Federico Capasso

  • Coherent plasmons in n-doped GaAs

    R. Kersting;J. N. Heyman;G. Strasser;K. Unterrainer

  • Ultrafast intraband spectroscopy of electron capture and relaxation in InAs/GaAs quantum dots

    T. Müller;F. F. Schrey;G. Strasser;K. Unterrainer

  • Temperature and Intensity Dependence of Intersubband Relaxation Rates from Photovoltage and Absorption.

    James Heyman;K Unterrainer;K Craig;B Galdrikian

  • Metallic wave-impedance matching layers for broadband terahertz optical systems.

    Josef Kröll;Juraj Darmo;Karl Unterrainer

  • Random lasers for broadband directional emission

    Sebastian Schönhuber;Martin Brandstetter;Thomas Hisch;Christoph Deutsch

  • Transition Between Coherent and Incoherent Electron Transport in GaAs / GaAlAs Superlattices

    C. Rauch;G. Strasser;K. Unterrainer;W. Boxleitner

  • Short pulse generation and mode control of broadband terahertz quantum cascade lasers

    Dominic Bachmann;Markus Rösch;Martin J. Süess;Mattias Beck

  • Analysis of silicon nitride partial Euler waveguide bends

    Florian Vogelbacher;Stefan Nevlacsil;Martin Sagmeister;Jochen Kraft

  • High power terahertz quantum cascade lasers with symmetric wafer bonded active regions

    Martin Brandstetter;Christoph Deutsch;Michael Krall;Hermann Detz

  • Ultrafast coherent electron transport in semiconductor quantum cascade structures

    F. Eickemeyer;K. Reimann;M. Woerner;T. Elsaesser

  • Time-domain measurement of intersubband oscillations in a quantum well

    James N. Heyman;Roland Kersting;Karl Unterrainer

  • GaAs/AlGaAs superlattice quantum cascade lasers at λ≈13 μm

    G. Strasser;S. Gianordoli;L. Hvozdara;W. Schrenk

  • Influence of doping on the performance of terahertz quantum-cascade lasers

    A. Benz;G. Fasching;A. M. Andrews;M. Martl

Frequent Co-Authors

Rudolf Bratschitsch
Rudolf Bratschitsch University of Münster
Arthur C. Gossard
Arthur C. Gossard University of California, Santa Barbara
Mattias Beck
Mattias Beck ETH Zurich
Yanlin Song
Yanlin Song Chinese Academy of Sciences
Thomas Elsaesser
Thomas Elsaesser Max Planck Society
Wolfgang Heiss
Wolfgang Heiss University of Erlangen-Nuremberg
Eugene E. Haller
Eugene E. Haller Lawrence Berkeley National Laboratory
Raffaele Colombelli
Raffaele Colombelli University of Paris-Saclay

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