Up to 70 THz bandwidth from an implanted Ge photoconductive antenna excited by a femtosecond Er:fibre laser

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2020
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Singh, Abhishek
Winnerl, Stephan
Welsch, Malte
Helm, Manfred
Schneider, Harald
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Phase-stable electromagnetic pulses in the THz frequency range offer several unique capabilities in time-resolved spectroscopy. However, the diversity of their application is limited by the covered spectral bandwidth. In particular, the upper frequency limit of photoconductive emitters - the most widespread technique in THz spectroscopy – reaches only up to 7 THz in the regular transmission mode due to absorption by infrared-active optical phonons. Here, we present ultrabroadband (extending up to 70 THz) THz emission from an Au-implanted Ge emitter that is compatible with mode-locked fibre lasers operating at wavelengths of 1.1 and 1.55 μm with pulse repetition rates of 10 and 20 MHz, respectively. This result opens up the possibility for the development of compact THz photonic devices operating up to multi-THz frequencies that are compatible with Si CMOS technology.

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ISO 690SINGH, Abhishek, Alexej PASHKIN, Stephan WINNERL, Malte WELSCH, Cornelius BECKH, Philipp SULZER, Alfred LEITENSTORFER, Manfred HELM, Harald SCHNEIDER, 2020. Up to 70 THz bandwidth from an implanted Ge photoconductive antenna excited by a femtosecond Er:fibre laser. In: Light: Science & Applications. Nature Publishing Group. 2020, 9(1), 30. eISSN 2047-7538. Available under: doi: 10.1038/s41377-020-0265-4
BibTex
@article{Singh2020bandw-49249,
  year={2020},
  doi={10.1038/s41377-020-0265-4},
  title={Up to 70 THz bandwidth from an implanted Ge photoconductive antenna excited by a femtosecond Er:fibre laser},
  number={1},
  volume={9},
  journal={Light: Science & Applications},
  author={Singh, Abhishek and Pashkin, Alexej and Winnerl, Stephan and Welsch, Malte and Beckh, Cornelius and Sulzer, Philipp and Leitenstorfer, Alfred and Helm, Manfred and Schneider, Harald},
  note={Article Number: 30}
}
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