Publications

2021

Flexible terahertz opto-electronic frequency comb light source tunable over 3.5 THz

D. Theiner, B. Limbacher, M. Jaidl, K. Unterrainer and J. Darmo

Optics Letters Vol. 46,Issue 22,pp. 5715-5718(2021)

Deep learning control of THz QCLs

B. Limbacher, S. Schoenhuber, M. A. Kainz, N. Bachelard, A. M. Andrews, H. Detz, G. Strasser, J. Darmo and K. Unterainer

Optics Express (29), Issue 15, pp. 23611-23621 (2021)

Comb operation in terahertz quantum cascade ring lasers

M. Jaidl, N. Opačak, M. A. Kainz, S. Schönhuber, D. Theiner, B. Limbacher, M. Beiser, M. Giparakis, A. M. Andrews, G. Strasser, B. Schwarz, J. Darmo, and K. Unterrainer

Optica 8 (6):780 (2021)

This article was featured on the cover of Optica (2021, Vol. 8, Issue 6).

2020

Terahertz optical machine learning for object recognition

B. Limbacher, S. Schönhuber, M. Wenclawiak, M. A. Kainz, A. M. Andrews, G. Strasser, J. Darmo and K. Unterrainer

APL Photonics 5(12):126103 (2020)
Click here to read the scilight article

The article was featured on the cover of APL Photonics (2020, Vol. 5, Issue 12):

The article was featured in the following news articles:
derstandard.at
analytik.news

Thermal-Dynamics Optimization of Terahertz Quantum Cascade Lasers with Different Barrier Compositions

M. A. Kainz, M. Wenclawiak, S. Schönhuber, M. Jaidl, B. Limbacher, A. M. Andrews, H. Detz, G. Strasser, and K. Unterrainer

Phys. Rev. Applied 14, 054012 (2020)

All-optical adaptive control of quantum cascade random lasers

S. Schönhuber, N. Bachelard, B. Limbacher, M. A. Kainz, A. M. Andrews, H. Detz, G. Strasser, J. Darmo, S. Rotter and K. Unterrainer

Nat. Commun. 11, 5530 (2020)

Superradiant Ensembles of Terahertz Polaritonic Meta-Atoms

M. Wenclawiak, A. M. Andrews, G. Strasser, K. Unterrainer and J. Darmo

IEEE Photonics Journal, vol.12, no. 5, pp. 1-8, Oct 2020

Resonant tunneling diodes strongly coupled to the cavity field

B. Limbacher,  M. A. Kainz, S. Schoenhuber, M. Wenclawiak, C. Derntl,  A. M. Andrews,  H. Detz,  G. Strasser,  A. Schwaighofer, B. Lendl, J. Darmo, and K. Unterrainer

Appl. Phys. Lett. 116, 221101 (2020)

2019

Dielectric control of localized plasmons in terahertz metamaterials

M. Wenclawiak, M. A. Kainz, K. Unterrainer, J. Darmo

Photonics and Nanostructures-Fundamentals and Applications 37 (2019)

Slot-Waveguide Silicon Nitride Organic Hybrid Distributed Feedback Laser

F. Vogelbacher, M. Sagmeister, J. Kraft, X. Zhou, J. Huang, M. Li, K. Jiang, Y. Song, K. Unterrainer & R. Hainberger 

Scientific Reports volume 9, 18438 (2019) 

Color switching of a terahertz quantum cascade laser

M. A. Kainz, S. Schönhuber, B. Limbacher A. M. Andrews, H. Detz, , G. Strasser, G. Bastard and K. Unterrainer

Appl. Phys. Lett. 114, 191104 (2019)

Thermoelectric-cooled terahertz quantum cascade lasers

M. A. Kainz, M. P. Semtsiv, G. Tsianos, S. Kurlov, W. T. Masselink, S. Schönhuber, H. Detz, W. Schrenk, K. Unterrainer, G. Strasser, and A. M. Andrews

Opt. Express 27, 20688-20693 (2019)

Material gain concentration quenching in organic dye-doped polymer thin films

F. Vogelbacher, X. Zhou, J. Huang, M. Li, K. Jiang, Y. Song, K. Unterrainer, and R. Hainberger

Optical Materials Express Vol. 9, Issue 3, pp. 1208-1222 (2019) 

Scattering strength dependence of terahertz random lasers

S. Schoenhuber, M. Wenclawiak,   M. A. Kainz, B. Limbacher,   A. M. Andrews,   H. Detz,   G. Strasser, J. Darmo, and K. Unterrainer

Journal of Applied Physics 125, 151611 (2019)

2018

Gain dynamics in a heterogeneous terahertz quantum cascade laser

C. G. Derntl, G. Scalari, D. Bachmann, M. Beck, J. Faist, K. Unterrainer and J. Darmo 

Appl. Phys. Lett. 113, 181102

Barrier Height Tuning of Terahertz Quantum Cascade Lasers for High-Temperature Operation

M. A. Kainz, S. Schönhuber, A. M. Andrews, H. Detz, B. Limbacher, G. Strasser, and K. Unterrainer

ACS Photonics 

Broadband Terahertz Detection with Zero-Bias Field-Effect Transistors between 100 GHz and 11.8 THz with a Noise Equivalent Power of 250 pW/ at 0.6 THz

S. Regensburger, S. Schonhuber, M. A. Kainz, S. Winnerl, J. M. Klopf, H. Lu, A. C. Gossard, K. Unterrainer, S. Preu

IEEE Transactions on Terahertz Science and Technology (2018)

Evaluation of Material Systems for THz Quantum Cascade Laser Active Regions

H. Detz, A. M. Andrews, M. A. Kainz, S. Schönhuber, T. Zederbauer, D. MacFarland, M. Krall, C. Deutsch, M. Brandstetter, P. Klang, W. Schrenk, K. Unterrainer, G. Strasser

Physica Status Solidi A, 1800504 (2018), S. 1 – 8.

2017

Heterogeneous terahertz quantum cascade lasers exceeding 1.9 THz spectral bandwidth and featuring dual comb operation

M. Rösch, M. Beck, M. J. Süess, D. Bachmann, K. Unterrainer, J. Faist, G. Scalari

Nanophotonics, 7, 1;  237- 242 (2017)

Direct Measurements of Terahertz Meta-atoms with Near-Field Emission of Terahertz Waves

K. Serita, J. Darmo, I. Kawayama, H. Murakami, M. Tonouchi

Journal of Infrared, Millimeter, and Terahertz Waves, 38, 9; 1107 – 1119 (2017)

High-Power Growth-Robust InGaAs/InAlAs Terahertz Quantum Cascade Lasers

C. Deutsch, M.A. Kainz, M. Krall, M. Brandsetter, D. Bachmann, S. Schönhuber, H. Detz, T. Zederbauer, D. MacFarland, A.M. Andrews, W. Schrenk, M. Beck, K. Ohtani, J. Faist, G. Strasser, and K. Unterrainer

ACS Photonics 4, 957 (2017)

Cooperative effects in an ensemble of planar meta-atoms

M. Wenclawiak, K. Unterrainer, and J. Darmo

Appl. Phys. Lett. 110, 261101 (2017)

Disk patch resonators for cavity quantum electrodynamics at the terahertz frequency

C. G. Derntl, D. Bachmann, K. Unterrainer, and J. Darmo 

Opt. Express 25, 12311 (2017)

2016

Dispersion in a broadband terahertz quantum cascade laser

D. Bachmann, M. Rösch, G. Scalari, M. Beck, J. Faist, K. Unterrainer, and J. Darmo

Appl. Phys. Lett. 109, 221107 (2016)

Spectrally resolved far-fields of terahertz quantum cascade lasers

M. Brandstetter, S. Schönhuber, M. Krall, M. A. Kainz, H. Detz, T. Zederbauer, A. M. Andrews, G. Strasser, and K. Unterrainer

Opt. Express 24, 25462-25470 (2016)

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

D. Bachmann, M. Rösch, M. J. Süess, M. Beck, K. Unterrainer, J. Darmo, J. Faist, and G. Scalari

Optica  3, 1087-1094 (2016). 

Random lasers for broadband directional emission

S. Schönhuber, M. Brandstetter, T. Hisch, C. Deutsch, M. Krall, H. Detz, A. Andrews, G. Strasser, S. Rotter, and K. Unterrainer

Optica  3, 1035-1038 (2016). 

InAs based terahertz quantum cascade lasers

M. Brandstetter, M. A. Kainz, T. Zederbauer, M. Krall, S. Schönhuber, H. Detz, W. Schrenz, A. M. Andrews, G. Strasser and K. Unterrainer Appl. Phys. Lett. 108, 011109 (2016)

2015

Improving the quality factor of the localized surface plasmon resonance

G.Lilley, M. Messner, and K. Unterrainer

Opt. Mater. Express 5, 2112-2120 (2015)

From Photonic Crystal to Subwavelength Micropillar Array Terahertz Lasers

M. Krall, M. Brandstetter, C. Deutsch, H. Detz, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer IEEE J. Sel. Top. Quantum Electron., Vol. 21, No. 6, 8500112 (2015)

 

Broadband terahertz amplification in a heterogeneous quantum cascade laser

D. Bachmann, N. Leder, M. Rösch, G. Scalari, M. Beck, H. Arthaber, J. Faist, K. Unterrainer, and J. Darmo Opt. Express 23, 3117 (2015)

 

Coupled cavity terahertz quantum cascade lasers with integrated emission monitoring

M. Krall, M. Martl, D. Bachmann, C. Deutsch, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer Opt. Express 23, 3581 (2015)

 

2015

Spectral gain profile of a multi-stack terahertz quantum cascade laser

D. Bachmann, M. Rösch, C. Deutsch, M. Krall, G. Scalari, M. Beck, J. Faist, K. Unterrainer, and J. Darmo

Appl. Phys. Lett. 105, 181118 (2014)

Importance of growth direction in mid-infrared quantum cascade lasers

Pierre M. Bouzi, YenTing Chiu, Christoph Deutsch, Yamac Dikmelik, Yu Song, Vadim Tokranov, Serge Oktyabrsky and Claire Gmachl

J. Appl. Phys. 116, 034504 (2014)

Reversing the pump dependence of a laser at an exceptional point

M. Brandstetter, M. Liertzer, C. Deutsch, P. Klang, J. Schöberl, H.E. Türeci, G. Strasser, K. Unterrainer and S. Rotter

Nature Communications 5, Article number: 4034

All-Electrical Thermal Monitoring of Terahertz Quantum Cascade Lasers

M. Krall, D. Bachmann, C. Deutsch, M. Brandstetter, H. Detz, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer

IEEE Photon. Technol. Lett., Vol. 26, No. 14, 1470-1473 (2014)

Resonant metamaterials detectors based on THz quantum-cascade structures

A. Benz, M. Krall, S. Schwarz, D. Dietze, H. Detz, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer

Scientific Reports, 4, 4269 (2014)

Subwavelength micropillar array terahertz lasers

M. Krall, M. Brandstetter, C. Deutsch, H. Detz, A. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer

Opt. Express  22, 274 (2014)

Free carrier absorption and inter-subband transitions in imperfect heterostructures

C. Ndebeka-Bandou, F. Carosella, R. Ferreira, A. Wacker and G. Bastard

Semiconductor Science and Technology, 29 (2014), 023001; S. 1 – 22.

2013

Spectrally coded optical nanosectioning (SpecON) with biocompatible metal–dielectric-coated substrates

K. Elsayad, A. Urich, P.S. Tan, M. Nemethova, J.V. Small, K. Unterrainer and K.G. Heinze

PNAS, online Early Edition, 25. November 2013

Rotating polarization spectroscopy for single nano-antenna characterization

G. Lilley and K. Unterrainer

Opt. Express 21, 30903 (2013)

Ultrastrong coupling of intersubband plasmons and terahertz metamaterials

D. Dietze, A. M. Andrews, P. Klang, G. Strasser, K. Unterrainer, and J. Darmo

Appl. Phys. Lett. 103, 201106 (2013)

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

M. Brandstetter, C. Deutsch, M. Krall, H. Detz, D. C. MacFarland, T. Zederbauer, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer

Appl. Phys. Lett. 103, 171113 (2013)

Magnetic-field assisted performance of InGaAs/GaAsSb terahertz quantum cascade lasers

S. Maero, L.-A. de Vaulchier, Y. Guldner, C. Deutsch, M. Krall, T. Zederbauer, G. Strasser, and K. Unterrainer, 

Appl. Phys. Lett. 103, 051116 (2013)

InGaAs/GaAsSb terahertz quantum cascade lasers

C. Deutsch, H. Detz, T. Zederbauer, M. Krall, M. Brandstetter, Aaron M. Andrews, P. Klang, W. Schrenk, G. Strasser, and K. Unterrainer

J Infrared Milli Terahz Waves 34, 374–385 (2013)

Influence of the facet type on the performance of terahertz quantum cascade lasers with double-metal waveguides

M. Brandstetter, M. Krall, C. Deutsch, H. Detz, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer

Appl. Phys. Lett. 102, 231121 (2013)

Efficient population transfer in modulation doped single quantum wells by intense few-cycle terahertz pulses

D. Dietze, J. Darmo, and K. Unterrainer

New J. Phys. 15, 065014 (2013)

Dopant migration effects in terahertz quantum cascade lasers

C. Deutsch, H. Detz, M. Krall, M. Brandstetter, T. Zederbauer, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer

Appl. Phys. Lett. 102, 201102 (2013)

Simultaneous positive and negative photocurrent response in asymmetric quantum dot infrared photodetectors

D. Alvarenga, C. A. Parra-Murillo, G. M. Penello, R. Kawabata, W. N. Rodrigues, D. R. Miquita, W. Schmidt, P. S. S. Guimaraes, M. P. Pires, K. Unterrainer, and P. L. Souza

J. Appl. Phys. 113, 043721 (2013)

Towards nanowire-based terahertz quantum cascade lasers: prospects and technological challenges

M. Krall, M. Brandstetter, C. Deutsch, H. Detz, T. Zederbauer, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer

Proc. SPIE 8640, 864018 (2013)

Probing scattering mechanisms with symmetric quantum cascade lasers

C. Deutsch, H. Detz, T. Zederbauer, A. M. Andrews, P. Klang, T. Kubis, G. Klimeck, M. E. Schuster, W. Schrenk, G. Strasser, and K. Unterrainer

Opt. Express 21, 7209 (2013)

Role of geometry for strong coupling in active terahertz metamaterials

D. Dietze, K. Unterrainer, and J. Darmo

Phys. Rev. B 87, 075324 (2013)

2012

Scanning laser terahertz near-field imaging system

K. Serita, S. Mizuno, H. Murakami, I. Kawayama, Y. Takahashi, M. Yoshimura, Y. Mori, J. Darmo, M. Tonouchi

Opt. Express 20, 12959 (2012)

Silver nanoisland enhanced Raman interaction in graphene

A. Urich, A. Pospischil, M. M. Furchi, D. Dietze, K. Unterrainer, and T. Müller

Appl. Phys. Lett. 101, 153113 (2012)

Exceptionally Narrow-Band Quantum Dot Infrared Photodetector

D. R. Alvarenga, C. A. Parra-Murillo, R. M. S. Kawabata, P. S. S. Guimarães, K. Unterrainer, M. P. Pires, G. S. Vieira, J.M. Villas-Boas, M. Maialle, M. H. Degani, P.F. Farinas, N. Studart, and P. L. Souza

IEEE J. Quant. El. 48, 1360 (2012)

Free-carrier absorption in quantum cascade structures

F. Carosella, C. Ndebeka-Bandou, R. Ferreira, E. Dupont, K. Unterrainer, G. Strasser, A. Wacker, and G. Bastard

Phys. Rev. B 85, 0853101 (2012)

High performance InGaAs/GaAsSb terahertz quantum cascade lasers operating up to 142 K

C. Deutsch, M. Krall, M. Brandstetter, H. Detz, A. M. Andrews, P. Klang, W. Schrenk, G. Strasser, and K. Unterrainer

Appl. Phys. Lett. 101, 2111171 (2012)

THz quantum cascade lasers with wafer bonded active regions

M. Brandstetter, C. Deutsch, A. Benz, G.D. Cole, H. Detz, A.M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer

Opt. Express 20, 23832 (2012)

Superconducting Microdisk Cavities for THz Quantum Cascade Lasers

M. Brandstetter, A. Benz, C. Deutsch, H. Detz, P. Klang, A.M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer

IEEE Trans. THz Sci. Technol. 2, 550 (2012)

THz-driven nonlinear intersubband dynamics in quantum wells

D. Dietze, J. Darmo, and K. Unterrainer

Opt. Express  20, 23053 (2012)

Microcavity-Integrated Graphene Photodetector

M. Furchi, A. Urich, A. Pospischil, G. Lilley, K. Unterrainer, H. Detz, P. Klang, A. M. Andrews, W. Schrenk, G. Strasser, and T. Mueller

Nano Letters 12, 2773 (2012)

Fluorescence enhancements and spectral modifications near the cut-off frequency of plasmonic structure

K. Elsayad, A. Urich, M. Nemethova, J.V. Small, K. Unterrainer, and K. G. Heinze

Proc. SPIE 8234, 82340W (2012)

Dynamically phase-matched terahertz generation

D. Dietze, K. Unterrainer, and J. Darmo

Opt. Lett. 37, 1047 (2012)

Terahertz emission from a two-color plasma filament in a slot waveguide

D. Dietze, K. Unterrainer and J. Darmo

Appl. Phys. Lett. 100, 091113 (2012)

2011

Intrinsic response time of graphene photodetectors

A. Urich, K Unterrainer and T. Mueller

Nano Letters 11, 2804 (2011)

Terahertz Active Photonic Crystals for Condensed Gas Sensing

A. Benz, C. Deutsch, M. Brandstetter, A. M. Andrews, P. Klang, H. Detz, W. Schrenk, G. Strasser, K. Unterrainer

Sensors 11, 6003 (2011)

Terahertz meta-atoms coupled to a quantum well intersubband transition

D. Dietze, A. Benz, G. Strasser, K. Unterrainer and J. Darmo

Opt. Express 14, 13700 (2011)

Nonorthodox heterodyne electro-optic detection for terahertz optical systems

J. Darmo, D. Dietze, M. Martl, and K. Unterrainer

Appl. Phys. Lett. 98, 161112 (2011)

Time-domain spectroscopy of mid-infrared quantum cascade lasers

W. Parz, R. Haddad, T. Müller, L.R. Wilson, J. Cockburn, A. Krysa, J. Roberts and K. Unterrainer

Semicond. Sci. Technol. 26, 014020 (2011)

Gain and losses in THz quantum cascade laser with metal-metal waveguide

M. Martl, J. Darmo, C. Deutsch, M. Brandstetter, A. M. Andrews, P. Klang, G. Strasser, and K. Unterrainer

Opt. Express 19, 733 (2011)

2010

Fast near-field imaging of spectrally broad sources using layered metallic structures

K. Elsayad, A. Urich, K. Unterrainer, and K. G. Heinze

Proceedings of SPIE 7757, 77573M (2010)

Terahertz quantum cascade lasers based on type II InGaAs/GaAsSb/InP

C. Deutsch, A. Benz, H. Detz, P. Klang, M. Nobile, A. M. Andrews, W. Schrenk, T. Kubis, P. Vogl, G. Strasser, and K. Unterrainer

Appl. Phys. Lett. 97, 261110 (2010)

Thermoelectric Effect in Quantum Cascade Lasers

M. Escarra, A. Benz, A. Bhatt, A. Hoffman, X. Wang, J. Fan, and C. Gmachl

IEEE Photonics Journal 2, 500 (2010)

Microdisk THz quantum-cascade lasers with super-conducting cavities

A. Benz, M. Brandstetter, C. Deutsch, G. Fasching, A. M. Andrews, P. Klang, W. Schrenk, G. Strasser, and K. Unterrainer

Proceeding of SPIE 7763, 776303 (2010)

Surface-emitting terahertz quantum cascade ring lasers

C. Deutsch, E. Mujagic, A. Benz, A. M. Andrews, P. Klang, H. Detz, W. Schrenk, G. Strasser, and K. Unterrainer

Proc. SPIE Int. Soc. Opt. Eng. 7763, 7763005 (2010)

Two-photon spectral hole burning spectroscopy of InAs/GaAs quantum dots

T. Moldaschl, W. Parz, T. Müller, S. Golka, G. Strasser and K. Unterrainer

Appl. Phys. Lett. 97, 011903 (2010)

Quasi phase-matched terahertz detector

J. Darmo, M. Martl and K. Unterrainer

Electron. Lett. 46, 788 (2010)

Guided Modes in Layered Semiconductor Terahertz Structures

D. Dietze, J. Darmo, and K. Unterrainer

IEEE J. Quant. Electron. 46, 618 (2010)

Dielectric properties of micaceous clays determined by terahertz time-domain spectrscopy

M. Janek, M. Matejdes, V. Szöcs, I. Bugár, A. Gaál, D. Velic, and J. Darmo

Philosophical Mag. 90, 2399 (2010)

Graphene photodetectors for high-speed optical communications

T. Müller, F. Xia, and P. Avouris

Nature Photonics, 4, 297 (2010)

Designer Laser Resonators based on Amplifying Photonic Crystals

A. Benz, C. Deutsch, G. Fasching, K. Unterrainer, A. M. Andrews, P. Klang, W. Schrenk, and G. Strasser

in: “Frontiers in Guided Wave Optics and Optoelectronics”, SCIYO, 2010, ISBN: 978-953-7619-82-4

Terahertz waveguide emitter with subwavelength confinement

M. Martl, J. Darmo, D. Dietze, K. Unterrainer, and E. Gornik

J. Appl. Phys. 107, 013110 (2010)

Ultrafast Spectroscopy As A Probe Of Light-Matter Interaction In A Midinfrared Quantum Cascade Laser

W. Parz, T. Müller, J. Darmo, M. Austerer, G. Strasser, L.R. Wilson, J. W. Cockburn, A. B. Krysa, J. S. Roberts, and K. Unterrainer

AIP Conf. Proc. 1199, 163 (2010)

THz time domain spectroscopy of surface electromagnetic waves

M. Martl, J. Darmo, K. Unterrainer, E. Gornik

AIP Conf. Proc. 1199, 479 (2010)

2009

Monolithic photonic crystal quantum-cascade laser

A. Benz, Ch. Deutsch, G. Fasching, K. Unterrainer, A.M. Andrews,P. Klang, W. Schrenk, and G. Strasser

Journal of Physics 193, 012061 (2009)

Intraband auger effect in quantum dot structures

T. Gebhard, K. Unterrainer, D. Alvarenga, P. S. S. Guimaraes, J. M. Villas-Boas, M. P. Pires, G. S. Vieira, and P. L. Souza

Journal of Physics 167, 012001 (2009)

Electrically controllable photonic molecule laser

G. Fasching, Ch. Deutsch, A. Benz, A. M. Andrews, P. Klang, R. Zobl, W. Schrenk, G. Strasser, P. Ragulis, V. Tamošiūnas, and K. Unterrainer

Opt. Express 17, 20321 (2009)

Optical study of InAs quantum dot stacks embedded in GaAs/AlAs superlattices

R. Nedzinskas, B. Cechavicius, J. Kavaliauskas, A. Cerskus, J. Kundrotas, V. Karpus, V. Tamosiunas, G. Valusis, G. Fasching, K. Unterrainer, and G. Strasser

Phys. Status Solidi C 6, 2710 (2009)

Atomic force microscopy based room temperature photocurrent-spectroscopy of single subsurface InAs quantum dots

W. Brezna, G. Fasching, K. Unterrainer, G. Strasser, and J. Smoliner

Phys. Status Solidi C 6, 793 (2009)

Superposition of negative contributions to the photocurrent spectrim of InAs/InAlGaAs/ InP quantum dot infrared photodetectors

T. Gebhard, D Alvarenga. M. P. Pires, K. Unterrainer, P. S. S. Guimarez and P. L. Souza

ECS Transactions 23, 521 (2009)

Intraband auger effect in quantum dot structures

T. Gebhard, K. Unterrainer, D. Alvarenga, P. S. S. Guimaraes, J. M. Villas-Boas,  M. P. Pires, G. S. Vieira, and P. L. Souza, 

Int. J. Mod. Phys. B 23, 2872 (2009)

Polarization of terahertz radiation from laser generated plasma filaments

D. Dietze, J. Darmo, S. Roither, A. Pugzlys, J. Heyman, and K. Unterrainer

J. Opt. Soc. Am. B  26, 2016 (2009)

Modulated reflectance study of InAs quantum dot stacks embedded in GaAs/AlAs superlattice

R. Nedzinskas, B. Čechavičius, J. Kavaliauskas, V. Karpus, D. Seliuta, V. Tamošiunas, G. Valušis, G. Fasching, K. Unterrainer, and G. Strasser 

J. Appl. Phys. 106, 064308 (2009)

Vertically emitting terahertz quantum cascade ring lasers

E. Mujagić, C. Deutsch, H. Detz, P. Klang, M. Nobile, A.M. Andrews, W. Schrenk, K. Unterrainer, G. Strasser

Appl. Phys. Lett. 95, 011120 (2009)

Photonic crystal mode terahertz lasers

A. Benz, C. Deutsch, G. Fasching, K. Unterrainer, A.M. Andrews, P. Klang, L. K. Hoffmann, W. Schrenk, and G. Strasser

J. Appl. Phys. 105, 122404 (2009)

Theory of nonequilibrium quantum transport and energy dissipation in terahertz quantum cascade lasers

T. Kubis, C. Yeh, P. Vogl, A. Benz, G. Fasching, and C. Deutsch

Phys. Rev. B 79, 195323 (2009)

High-field splitting of the cyclotron resonance absorption in strained p-InGaAs/GaAs quantum wells

O. Drachenko, D. V. Kozlov, V. Ya. Aleshkin, V. I. Gavrilenko,  K. V. Maremyanin, A. V. Ikonnikov, B. N. Zvonkov, M. Goiran, J. Leotin, G. Fasching, S. Winnerl, H. Schneider, J. Wosnitza,  M. Helm

Phys. Rev. B 79, 073301 (2009)

Coherent control of ground state excitons in the nonlinear regime within an ensemble of InAs quantum dots

T. Moldaschl, T. Müller, S. Golka, W. Parz, G. Strasser, K. Unterrainer

Phys. Stat. Solidi C 6, 876 (2009)

Excitation of terahertz surface plasmon polaritons on etched groove gratings

M. Martl, J. Darmo, K. Unterrainer, and E. Gornik

J. Opt. Soc. Am. B 26, 554 (2009)

Active photonic crystal terahertz laser

A. Benz, C. Deutsch, G. Fasching, K. Unterrainer, A. M. Andrews, P. Klang, W. Schrenk, and G. Strasser

Opt. Express 17, 941 (2009)

Intersubband gain induced dispersion

W. Parz, T. Müller, J. Darmo, K. Unterrainer, M. Austerer, G. Strasser, L. R. Wilson, J. W. Cockburn, A. B. Krysa, and J. S. Roberts

Opt. Lett. 34, 208, (2009)

2008

Ultrafast phase-resolved pump-probe measurements on a quantum cascade laser

W. Kühn, W. Parz, P. Gaal, K. Reimann, M. Woerner, T. Elsaesser, T. Müller, J. Darmo, K. Unterrainer, M. Austerer, G. Strasser, L. R. Wilson, J. W. Cockburn, A. B. Krysa, and J. S. Roberts

Appl. Phys. Lett. 93, 151106 (2008)

G. Fasching, A. Benz, Ch. Deutsch, A. M. Andrewsa, R. Zobl, P. Klang, W. Schrenk, G. Strasser, V. Tamosiunas, and K. Unterrainer

Physica E 40, 1840 (2008)

Numerical sampling rules for paraxial regime pulse diffraction calculations

D. P. Kelly, B. M. Hennelly, A. Grün, and K. Unterrainer

J. Opt. Soc. Am. A 25, 2299 (2008)

Intraband Auger effect in InAs/InGaAlAs/InP Quantum Dot Structures

T. Gebhard, D. Alvarenga, P. L. Souza, P. S. S. Guimarães, K. Unterrainer, M. P. Pires, G. S. Vieira, and J. M. Villas-Boas

Appl. Phys. Lett. 93, 052103 (2008)

Acoustic phonon-assisted damping of Rabi oscillations in InAs quantum dots

T. Moldaschl, T. Müller, S. Golka, G. Strasser, K. Unterrainer

Phys. E 40, 2013 (2008)

Ultrafast probing of light-matter interaction in a mid-infrared quantum cascade laser

W. Parz, T. Müller, J. Darmo, K. Unterrainer, M. Austerer, G. Strasser, L. R. Wilson, J. W. Cockburn, A. B. Krysa, and J. S. Roberts

Appl. Phys. Lett. 93, 091105 (2008)

Doping depedence of LO-phonon depletion scheme THz quantum-cascade lasers

A. M. Andrews, A. Benz, C. Deutsch, G. Fasching, K. Unterrainer, P. Klang, W. Schrenk, G. Strasser

Mater. Sci. Eng., B 147, 152 (2008)

Terahertz quantum cascade devices: from intersubband transition to microcavity laser

K. Unterrainer, A. Benz, J. Darmo, C. Deutsch, G. Fasching, J. Kröll, D. P. Kelly, M. Martl, T. Müller, W. Parz, S. S. Dhillon, C. Sirtori, A. M. Andrews, W. Schrenk, G. Strasser, X. Marcadet, M. Calligaro, H. E. Beere, and D. A. Ritchie

IEEE J. Sel. Top. Quant. El. 14, 307 (2008)

Femtosecond Spectral Hole Burning

T. Moldaschl, W. Parz, S. Golka, G. Strasser and K. Unterrainer

Acta Physica Polonica A 113, 777 (2008)

Ultrafast resonant terahertz response of excitons in semiconductor quantum dots

T. Müller, W. Parz, K. Unterrainer, S. Sauvage, J. Houel, P. Boucaud, A. Miard,  and A. Lemaître

Phys. Rev. B 77, 035314 (2008)

2007

Spread Space Spread Spectrum Technique for Secure Multiplexing

B. M. Hennelly, J. T. Sheridan, D. P. Kelly, G. Unnikrishnan, B. Javidi, T. J. Naughton, J. McDonald 

Opt. Lett. 32, 1060 (2007)

Fundamental diffraction limitations in a paraxial 4-f imaging system with coherent and incoherent illumination

D P. Kelly, J. T. Sheridan, William T. Rhodes

J. Opt. Soc. A 24, 1911 (2007)

Controlling speckle using lenses and free space

D. P. Kelly, J. E. Ward, U. Gopinathan, and J. T. Sheridan

Opt. Lett. 32, 3394 (2007)

Two-electron states bound to interface defects in quantum cascade lasers subject to a strong magnetic field

R. Ferreira, G. Bastard, C. Sirtori, G. Strasser, and K. Unterrainer

Phys. Rev. B 76, 165322 (2007)

Spread Space Spread Spectrum Technique for Secure Multiplexing

B. M. Hennelly, J. T. Sheridan, D. P. Kelly, G. Unnikrishnan, B. Javidi, T. J. Naughton, J. McDonald 

Opt. Lett. 32, 1060 (2007)

Phase-resolved measurement of stimulated emission in a laser

J. Kröll, J. Darmo, S.S. Dhillon, X. Marcadet, M. Calligaro, C. Sirtori and K. Unterrainer

Nature 449, 698 (2007)

Subwavelength Microdisk and Microring Terahertz Quantum-Cascade Lasers

G. Fasching, V. Tamosiunas, A. Benz, A. M. Andrews, K. Unterrainer, R. Zobl, T. Roch, W. Schrenk, and G.  Strasser

IEEE J. Quant. El. 43, 687 (2007)

Terahertz photonic crystal resonators in double-metal waveguides

A. Benz, C. Deutsch, G. Fasching, A.M. Andrews, K. Unterrainer, P. Klang, W. Schrenk, and G. Strasser

Opt. Express 15, 12418 (2007)

Longitudinal spatial hole burning in terahertz quantum cascade lasers

J. Kröll, J. Darmo, K. Unterrainer, S. S. Dhillon, C. Sirtori, X. Marcadet and M. Calligaro

Appl. Phys. Lett. 91, 161108 (2007)

Metallic wave-impedance matching layers for broad-band optical systems

J. Kröll, J. Darmo and K. Unterrainer

Opt. Express 15, 67552 (2007)

Terahertz optical activity of sucrose single crystals

J. Kröll, J. Darmo and K. Unterrainer

Vibrational Spectroscopy 43, 324 (2007)

Quantum dot structures grown on Al containing quaternary material for infrared photodetection beyond 10  µm

P. L. Souza, A. J. Lopes, T. Gebhard, K. Unterrainer, M. P. Pires, J. M. Villas-Boas, G. S. Vieira, P. S. S. Guimarães, and N. Studart

Appl. Phys. Lett. 90, 173510 (2007)

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

A. Benz, G. Fasching, A. M. Andrews, M. Martl, K. Unterrainer, T. Roch, W. Schrenk, S. Golka, and G. Strasser

Appl. Phys. Lett. 90, 101107 (2007)

Polarization dependence of intraband transitions in QDIPs

T. Gebhard, P.L. Souza, F.F. Schrey, G. Strasser, K. Unterrainer, M.P. Pires, S.M. Landi, J.M. Villas-Boas, N. Studart

Phys. Stat. Sol. C 4, 304 (2007)

2006

Single InAs/GaAs quantum dots: Photocurrent and cross-sectional AFM analysis

G. Fasching, F.F. Schrey, T. Roch, A.M. Andrews, W. Brezna, J. Smoliner, G. Strasser and K. Unterrainer

Physica E 32, 183 (2006)

Microcavity THz quantum cascade laser

G. Fasching, A. Benz, R. Zobl, A.M. Andrews, T. Roch, W. Schrenk, G. Strasser, V. Tamosiunas, and K. Unterrainer

Physica E 32, 316 (2006)

Ultrafast spectral hole burning spectroscopy of exciton spin flip processes in InAs/GaAs quantum dots

T. Müller, G. Strasser, and K. Unterrainer

Appl. Phys. Lett. 88, 192105 (2006)

2005

Microcavity terahertz quantum-cascade laser

G. Fasching, A. Benz, R. Zobl, A. M. Andrews, T. Roch, W. Schrenk, G. Strasser, and K. Unterrainer

Proc. SPIE Int. Soc. Opt. Eng. 6010, 601006 (2005)

Terahertz Microcavity Quantum Cascade Lasers

G. Fasching, A. Benz, K. Unterrainer, R. Zobl, A. M. Andrews, T. Roch, W. Schrenk, and G. Strasser

Appl. Phys. Lett. 87, 21112(2005)

Photocurrent spectroscopy of single InAs/GaAs quantum dots

G. Fasching, F. F. Schrey, W. Brezna, J. Smoliner, G. Strasser, and K. Unterrainer

Phys. Stat. Sol. C 8, 3114 (2005)

Intersublevel dynamics in semiconductor quantum dots

F. F. Schrey, T. Müller, G. Fasching, S. Anders, C. Pflügl, W. Schrenk, G. Strasser, and K. Unterrainer

Physica E, 25, 271 (2004)

Intraband transitions in quantum dot superlattice heterostructures

F. F. Schrey, L. Rebohle, T. Müller, G. Strasser, K. Unterrainer, D. P. Nguyen, N. Regnault, R. Ferreira, and G. Bastard 

Phys. Rev. B 72, 155310 (2005)

THz collective oscillations of ballistic electrons in wide potential wells: Bridging classical transport with quantum dynamics

M. Eckardt, M. Betz, A. Schwanhäußer, S. Trumm, F. Sotier, L. Robledo, S. Malzer, T. Müller, K. Unterrainer, A. Leitenstorfer, and G. H. Döhler

Europhys. Lett. 70, 534 (2005)

Tracing deeply buried InAs/GaAs quantum dots using AFM and wet chemical etching

G. Fasching, W. Brezna, J. Smoliner, G. Strasser, and K. Unterrainer

Appl. Phys. Lett. 86, 063111 (2005)

Time and frequency resolved THz spectroscopy of micro- and nano-systems

J. Kröll, J. Darmo, and K. Unterrainer

Acta Physica Polonica A 107, 92 (2005)

Finite-Difference Time-Domain Simulation of Mid- and Far- Infrared Quantum Cascade Lasers

V. Tamosiunas, Z. Kancleris, M. Dagys, R. Simniskis, M. Tamosiuniene, G. Valuris, G. Strasser, and K. Unterrainer

Acta Physica Polonica A 107, 179 (2005)

Influence of carrier-carrier interaction on the time-dependent intersubband absorption in a semiconductor quantum well

T. Müller, W. Parz, G. Strasser, and K. Unterrainer

Phys. Rev  B 70, 155324 (2004)

2004

Optically induced intraband electron transfer in self-assembled InAs quantum dots

F. F.Schrey, G. Fasching, T. Müller, G. Strasser, and K. Unterrainer

Phys. Stat. Sol. C 1, 434 (2004)

High performance of terahertz electro-optic detector

J. Kröll, J. Darmo, and K, Unterrainer

Electron. Lett. 40, 763 (2004)

New generation of photoconductive few-cycle Terahertz emitters

J. Darmo, G. Strasser, T. Roch, T. Müller, K. Unterrainer, G. Tempea, T. Le, and A. Stingl

Ultrafast Optics IV, Springer Series in Optical Sciences, Vol. 95, Krausz, F.; Korn, G.; Corkum, P.; Walmsley, I.A. (Eds.), (Springer, Berlin 2004) pp. 407-412.

Imaging with a Terahertz quantum cascade laser

J. Darmo, V. Tamosiunas, G. Fasching, J. Kröll, and K. Unterrainer

Opt. Express 12, 1879 (2004)

Intraband relaxation of photoexcited electrons in GaAs/AlGaAs quantum wells and InAs/GaAs self-assembled quantum dots

T. Müller, W. Parz, F. Schrey, G. Strasser, and K. Unterrainer

Semicond. Sci. Technol. 19, 287 (2004)

Exotic transport regime in GaAs: absence of intervalley scattering leading to quasi-ballistic, reals-space THz oscillations

M. Eckardt, A. Schwanhäußer, L. Robledo, S. Malzer, G. H. Döhler, M. Betz, S. Trumm, A. Leitenstorfer, T. Müller, and K. Unterrainer

Semicond. Sci. Technol., 19, 195 (2004)

Magnetic field effects in Terahertz Quantum Cascade Lasers

V. Tamosiunas, R. Zobl, G. Fasching, J. Ulrich, G. Strasser, K. Unterrainer, R. Colombelli, C. Gmachl, K. West, L. Pfeiffer, and F. Capasso

Semicond. Sci. Technol. 19, 348 (2004)

Few-cycle THz generation and spectroscopy of nanostructures

J. Darmo, T. Müller, W. Parz, J. Kröll, G. Strasser, K. Unterrainer

Phil. Trans. R. Soc. Lond. A 362, 1 (2004)

Pulse-Induced Quantum Interference of Intersubband Transitions in Coupled Quantum Wells

T. Müller, W. Parz, G. Strasser, and K. Unterrainer

Appl. Phys. Lett. 84, 64 (2004)

2003

Terahertz Quantum Cascade Lasers in a Magnetic Field

V. Tamosiunas, R. Zobl, J. Ulrich, K. Unterrainer, R. Colombelli, C. Gmachl, F. Capasso, K. West, and L. Pfeiffer

Appl. Phys. Lett. 83, 3873 (2003)

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

T. Müller, F. F. Schrey, G. Strasser, and K. Unterrainer 

Appl. Phys. Lett. 83, 3572 (2003)

Terahertz emitter with an integrated semiconductor Bragg mirror

J. Darmo, T. Müller, G. Strasser, K. Unterrainer, and G. Tempea

Electron. Lett. 39, 640 (2003)

Electroluminescence of a quantum dot cascade structure

S. Anders, L. Rebohle, F. F. Schrey, W. Schrenk, K. Unterrainer, and G. Strasser

Appl. Phys. Lett. 82, 3862 (2003)

Energy level engineering in InAs quantum dot stacks embedded in AlAs/GaAs superlattices

L. Rebohle, F. F. Schrey, S. Hofer, G. Strasser, and K. Unterrainer

Physica  E 17, 42 (2003)