Investigation of MIR-pumped quantum-cascade structures as emitters of THz radiation
Wienold, M. and Giehler, M. and Schrottke, L. and Hey, R. and Winnerl, S. and Schneider, H. and Pavlov, S.G. and Grahn, H.T. (2010) Investigation of MIR-pumped quantum-cascade structures as emitters of THz radiation. In: Abstracts of the Int. Workshop on Terahertz spectroscopy and its high-field applications, p. 40. International Workshop on Terahertz spectroscopy and its high-field applications, 14.-15. Jun. 2010, Dresden-Rossendorf, Germany.
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One proposal to obtain THz radiation from a compact semiconductor source at room temperatures is based on an optically pumped, electrically driven (OPED) quantum-cascade structure. It has been theoretically shown that such a structure may allow for overcoming the fundamental Manley-Rowe limit of frequency conversion by recycling the pump photons. Furthermore, quantum coherence effects and gain without inversion have been predicted. However, the realization of such a structure has proven to be difficult, which is due to nonlinear transport effects such as the formation of electric-field domains. We investigate the influence of MIR pumping on the electrical transport properties in different OPED quantum-cascade structure. Experiments are performed using free-electron laser (FEL) radiation in the range of 10 to 12 μm. Although the effect of the FEL pumping on the transport properties is rather small and ambiguous, in particular with respect to different polarization directions, a small emission signal in the THz range is observed. Additional experiments with a pulsed CO2 laser show a clear influence of the pumping being on or off and of its polarization direction on the dc current-voltage characteristics.
|Document Type:||Conference or Workshop Item (Poster)|
|Title:||Investigation of MIR-pumped quantum-cascade structures as emitters of THz radiation|
|Journal or Publication Title:||Abstracts of the Int. Workshop on Terahertz spectroscopy and its high-field applications|
|Page Range:||p. 40|
|Keywords:||THz, quantum cascade laser|
|Event Title:||International Workshop on Terahertz spectroscopy and its high-field applications|
|Event Location:||Dresden-Rossendorf, Germany|
|Event Dates:||14.-15. Jun. 2010|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Transport|
|HGF - Program Themes:||V VM - Verkehrsmanagement|
|DLR - Research area:||Transport|
|DLR - Program:||V VM - Verkehrsmanagement|
|DLR - Research theme (Project):||V - FAMOUS (old)|
|Institutes and Institutions:||Institute of Planetary Research > Terahertz and Infrared Sensors|
|Deposited By:||Dr. Sergey Pavlov|
|Deposited On:||04 Jan 2011 21:42|
|Last Modified:||11 Jan 2011 12:48|
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