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1

Time and Frequency Resolved THz Spectroscopy of Micro- and Nano-Systems

100%

Kröll J., Darmo J., Unterrainer K.

Acta Physica Polonica A

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2005

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vol. 107

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issue 1

92-98

EN

Terahertz time-domain spectroscopy is applied to characterize ultra-thin metallic layers and nanoscale composite material - single-wall carbon nanotube mat.

2

Femtosecond Spectral Hole Burning Spectroscopy as a Probe of Exciton Dynamics in Quantum Dots

76%

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

Acta Physica Polonica A

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2008

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vol. 113

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issue 3

777-782

EN

We present measurements of the dynamics of photoexcited excitons in an ensemble of InAs/GaAs self-assembled quantum dots using a femtosecond spectral hole burning technique. We use this technique to examine the exciton spin relaxation and the line shape of optical transitions in the dots.

3

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

64%

Tamošiūnas V., Kancleris Ž., Dagys M., Simniškis R., Tamošsiūnienė M., Valušis G., Strasser G., Unterrainer K.

Acta Physica Polonica A

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2005

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vol. 107

|

issue 1

179-183

EN

We present simulations of mid- and far-infrared quantum cascade lasers operating with/without external magnetic field. Maxwell-Bloch solver based on the finite-difference time-domain method was used in our investigation. Reduction of the far-infrared quantum cascade laser emission intensity is associated with increased optical losses in highly doped layers when magnetic field is changed from 4.2 T to 6.2 T. A simulated emission spectrum of mid-infrared disc-shaped quantum cascade laser with 60μm radius is consistent with the experimentally observed irregular spacing between quantum cascade laser emission lines.

4

Energy Spectrum of InAs Quantum Dots in GaAs/AlAs Superlattices

64%

Nedzinskas R., Čechavičius B., Kavaliauskas J., Karpus V., Krivaitė G., Tamošiūnas V., Valušis G., Schrey F., Unterrainer K., Strasser G.

Acta Physica Polonica A

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2008

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vol. 113

|

issue 3

975-978

EN

Photo- and contactless electroreflectance spectroscopies were applied to study optical properties and electronic structure of GaAs/AlAs superlattice systems with embedded InAs quantum dots. The observed interband transitions related to the quantum dot ground and excited states, as well as optical transitions in the combined system formed by the InAs wetting layer and GaAs/AlAs superlattice are discussed.

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4 Acta Physica Polonica A

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1 Dagys M.

1 Darmo J.

1 Golka S.

1 Kancleris Ž.

1 Karpus V.

1 Kavaliauskas J.

1 Krivaitė G.

1 Kröll J.

1 Moldaschl T.

1 Műller T.

1 Nedzinskas R.

1 Parz W.

1 Schrey F.

1 Simniškis R.

1 Tamošsiūnienė M.

1 Čechavičius B.

Time and Frequency Resolved THz Spectroscopy of Micro- and Nano-Systems

Femtosecond Spectral Hole Burning Spectroscopy as a Probe of Exciton Dynamics in Quantum Dots

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

Energy Spectrum of InAs Quantum Dots in GaAs/AlAs Superlattices