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Intersubband Emitters

GaAs/(Al,Ga)As-based heterostructures are the material of choice for intersubband emitters in the terahertz (THz) region. The THz spectral region ranges typically from 0.1 to 10 THz bridging the electronics-based microwave region with the optics-based infrared region. 

 

The THz region is of great interest for spectroscopic applications, since many molecules exhibit absorption bands in this spectral range due to rotational energy levels. While absorption spectroscopy can be used for the detection of organic materials such as drugs or cancer tissue in medical investigations, monochromatic THz sources serve as local oscillators in heterodyne receivers. Furthermore, imaging with THz radiation can be used for material testing or security purposes.

Selected Publications

11 Author L. Schrottke , X. Lü , G. Rozas , K. Biermann , H. T. Grahn
Title

Terahertz GaAs/AlAs quantum-cascade lasers

Source Appl. Phys. Lett. , 108 , 102102 ( 2016 )
DOI : 10.1063/1.4943657 | Download: PDF | 2797 Cite : Bibtex RIS
L. Schrottke, X. Lü, G. Rozas, K. Biermann, and H. T. Grahn

10 Author M. Hempel , B. Röben , L. Schrottke , H.-W. Hübers , H. T. Grahn
Title

Fast continuous tuning of terahertz quantum-cascade lasers by rear facet illumination

Source Appl. Phys. Lett. , 108 , 191106 ( 2016 )
DOI : 10.1063/1.4949528 | Download: PDF | 2786 Cite : Bibtex RIS
M. Hempel, B. Röben, L. Schrottke, H.-W. Hübers, and H. T. Grahn

9 Author M. Wienold , B. Röben , X. Lü , G. Rozas , L. Schrottke , K. Biermann , H. T. Grahn
Title

Frequency dependence of the maximum operating temperature for quantum-cascade lasers up to 5.4 THz

Source Appl. Phys. Lett. , 107 , 202101 ( 2015 )
DOI : 10.1063/1.4935942 | Download: PDF | 2747 Cite : Bibtex RIS
M. Wienold, B. Röben, X. Lü, G. Rozas, L. Schrottke, K. Biermann, and H. T. Grahn

8 Author L. Schrottke , X. Lü , H. T. Grahn
Title

Fourier transform-based scattering-rate method for self-consistent simulations of carrier transport in semiconductor heterostructures

Source J. Appl. Phys. , 117 , 154309 ( 2015 )
DOI : 10.1063/1.4918671 | Download: PDF | 2673 Cite : Bibtex RIS
L. Schrottke, X. Lü, and H. T. Grahn

7 Author X. Lü , L. Schrottke , E. Luna , H. T. Grahn
Title

Efficient simulation of the impact of interface grading on the optical and transport properties of semiconductor heterostructures

Source Appl. Phys. Lett. , 104 , 232106 ( 2014 )
DOI : 10.1063/1.4882653 | Download: PDF | 2566 Cite : Bibtex RIS
X. Lü, L. Schrottke, E. Luna, and H. T. Grahn

6 Author M. Wienold , B. Röben , L. Schrottke , R. Sharma , A. Tahraoui , K. Biermann , H. T. Grahn
Title

High-temperature, continuous-wave operation of terahertz quantum-cascade lasers with metal-metal waveguides and third-order distributed feedback

Source Opt. Express , 22 , 3334 ( 2014 )
DOI : 10.1364/OE.22.003334 | Download: PDF | 2503 Cite : Bibtex RIS
M. Wienold, B. Röben, L. Schrottke, R. Sharma, A. Tahraoui, K. Biermann, and H. T. Grahn

5 Author X. Lü , M. Wienold , L. Schrottke , K. Biermann , H.T. Grahn
Title

Mid-infrared-pumped, electrically driven terahertz quantum laser: enhanced pumping efficiency and prevention of electric-field domains

Source J. Appl. Phys. , 113 , 033103 ( 2013 )
Download: PDF | 2378 Cite : Bibtex RIS
X. Lü, M. Wienold, L. Schrottke, K. Biermann, and H.T. Grahn

4 Author L. Schrottke , M. Wienold , R. Sharma , X. Lü , K. Biermann , R. Hey , A. Tahraoui , H. Richter , H.-W. Hübers , H.T. Grahn
Title

Quantum-cascade lasers as local oscillators for heterodyne spectrometers in the spectral range around 4.745 THz

Source Semicond. Sci. Technol. , 28 , 035011 ( 2013 )
2335 Cite : Bibtex RIS
L. Schrottke, M. Wienold, R. Sharma, X. Lü, K. Biermann, R. Hey, A. Tahraoui, H. Richter, H.-W. Hübers, and H.T. Grahn

3 Author M. Wienold , A. Tahraoui , L. Schrottke , R. Sharma , X. Lü , K. Biermann , R. Hey , H.T. Grahn
Title

Lateral distributed-feedback gratings for single-mode, high-power terahertz quantum-cascade lasers

Source Opt. Express , 20 , 11207 ( 2012 )
Download: PDF | 2277 Cite : Bibtex RIS
M. Wienold, A. Tahraoui, L. Schrottke, R. Sharma, X. Lü, K. Biermann, R. Hey, and H.T. Grahn

2 Author M. Giehler , M. Wienold , L. Schrottke , R. Hey , H.T. Grahn , S. G. Pavlov , H.-W. Hübers , S. Winnerl , H. Schneider
Title

Mid-infrared pump-related electric-field domains in GaAs/(Al,Ga)As quantum-cascade structures for terahertz lasing without population inversion

Source J. Appl. Phys. , 110 , 103104 ( 2011 )
Download: PDF | 2254 Cite : Bibtex RIS
M. Giehler, M. Wienold, L. Schrottke, R. Hey, H.T. Grahn, S. G. Pavlov, H.-W. Hübers, S. Winnerl, and H. Schneider

1 Author R. Sharma , L. Schrottke , M. Wienold , K. Biermann , R. Hey , H.T. Grahn
Title

Effect of stimulated emission on the transport characteristics of terahertz quantum-cascade lasers

Source Appl. Phys. Lett. , 99 , 151116 ( 2011 )
Download: PDF | 2246 Cite : Bibtex RIS
R. Sharma, L. Schrottke, M. Wienold, K. Biermann, R. Hey, and H.T. Grahn

Contact

Prof. Dr. Holger T. Grahn

Head of Department 

+49 30 20377-318

htgrahn@pdi-berlin.de

Dr. Lutz Schrottke

Senior Scientist

+49 30 20377-339

lab: -319

lutz@pdi-berlin.de