Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 90: Poster Session: Quantum information systems; Optical properties; Ultrafast phenomena

HL 90.19: Poster

Thursday, March 14, 2013, 16:00–20:00, Poster A

Transient conductivity measurements using THz time-domain spectroscopy(THz-TDS) — •Andreas Paulke, Daniel Schick, Peter Gaal, and Matias Bargheer — Institut für Physik und Astronomie, Universität Potsdam

Single cycle THz Pulses with a center frequency of 2THz and spectral width of 2THz corresponding to a sub-picosecond temporal width (τ_P ≈ 0.5ps) are generated via difference-frequency mixing of femtosecond laser pulses in GaSe and detected with electro-optic sampling in ZnTe. Transmitted or reflected THz pulses from samples are measured in the time-domain to get the full complex dieelectric function of the sample.The dielectric function є(ω) is equivalent to the frequency dependent conductivity σ(ω).

In addition optical pump/ THz probe spectroscopy on semiconductors is performed to investigate the temporal evolution of photoconductivity after optical excitation with picosecond resolution. This concept is further applied to various other samples ranging from complex oxides to solar cell materials.