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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.96: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

A ultrafast Optical-pump/THz-probe spectrometer based on sub-diffraction field confinement — •Julia A. Lang, Michael Seidel, and Georg Herink — Experimental Physics VIII, University of Bayreuth, Germany

Time-resolved THz spectroscopy is a powerful tool for characterizing transient carrier dynamics in electronic materials and devices. In this contribution, we present an optical-pump/THz-probe spectrometer based on a high-repetition rate femtosecond fiber laser and photoconductive antennas combined with resonant microstructures for signal amplification. In particular, this approach exploits sub-diffraction Terahertz confinement in metallic microstructures to reduce the large mismatch between optical and THz foci. We demonstrate local spectroscopy of carrier dynamics in a semiconductor material inside a single resonator and corroborate our findings with finite-element simulations.