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HL: Fachverband Halbleiterphysik

HL 30: Poster I

HL 30.36: Poster

Tuesday, March 17, 2020, 13:30–15:45, P3

Optical-pump/THz-probe spectrometer using mode-matching via field-enhancement — •Julia Lang, Michael Seidel, and Georg Herink — Experimental Physics VIII, University of Bayreuth, Germany

Optical-pump/THz-probe spectroscopy presents a powerful scheme for characterizing the transient carrier dynamics in electronic materials and devices. In order to improve the sample excitation and the probe signal strength, we introduce mode-matching between optical-pump and THz-probe. Specifically, this approach employs sub-diffraction Terahertz confinement in metallic microstructures to reduce the large mismatch between optical and THz foci. The setup, based on a compact high repetition rate mode-locked fiber laser, efficient frequency conversion and photoconductive detection, is demonstrated for transient spectroscopy of photo-induced charge carriers in semiconductors.