Germanium as an ultrabroadband THz material

Helm, Manfred; Singh, Abhishek; Pashkin, Oleksiy; Winnerl, Stephan; Beckh, Cornelius; Sulzer, Philipp; Leitenstorfer, Alfred; Schneider, Harald

Germanium as an ultrabroadband THz material

Helm, M.; Singh, A.; Pashkin, O.; Winnerl, S.; Beckh, C.; Sulzer, P.; Leitenstorfer, A.; Schneider, H.

Abstract

Germanium, as an elemental semiconductor, has no Reststrahlen band and is thus suited as a broadband THz material, even for THz generation. The drawback of its long carrier lifetime due to the indirect band gap can be remedied through ion implantation, and the relatively small size of the gap allows excitation with fiber lasers in the telecom range. We demonstrate THz emission from Ge photoconductive antennas reaching as far as 70 THz.

Keywords: germanium; THz; photoconductive antenna; braodband

Eingeladener Vortrag (Konferenzbeitrag) (Online Präsentation)
RJUSE TeraTech 2021, 01.-04.11.2021, Sendai, Japan
Beitrag zu Proceedings
RJUSE TeraTech 2021, 01.-04.11.2021, Sendai, Japan
RJUSE TeraTech 2021 Conference Digest

Permalink: https://www.hzdr.de/publications/Publ-33354