Tunable ultrabroadband hybrid THz emitter combining a spintronic THz source and a GaSe crystal
Abstract
Linear terahertz time-domain spectroscopy (THz-TDS) is a sensitive probe for material characterization including thickness measurements of thin layers. These applications critically rely on a sufficiently large bandwidth, which is not straightforwardly available in typical THz-TDS systems. Here, we introduce a hybrid THz-emitter concept based on a spintronic THz emitter that is deposited onto a thin freestanding GaSe nonlinear crystal. By tuning the parameters of this hybrid emitter, we generate an ultrabroadband spectrum covering the full range from 1 to 40 THz without any gaps at high spectral amplitudes, resulting in ultrashort THz-pulse durations of only 32 fs. Finally, we demonstrate the straightforward tunability of the carrier-envelope phase from unipolar or bipolar THz pulses with ultrashort duration.
Keywords
Cite
@article{arxiv.2310.12012,
title = {Tunable ultrabroadband hybrid THz emitter combining a spintronic THz source and a GaSe crystal},
author = {Afnan Alostaz and Oliver Gueckstock and Jungwei Tong and Jana Kredl and Chihun In and Markus Münzenberg and Tom S. Seifert},
journal= {arXiv preprint arXiv:2310.12012},
year = {2023}
}