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

Abhishek Singh; Alexej Pashkin; Stephan Winnerl; Malte Welsch; Cornelius Beckh; Philipp Sulzer; Alfred Leitenstorfer; Manfred Helm; Harald Schneider

doi:10.1038/s41377-020-0265-4

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

Article

- Up to 70 THz bandwidth from an implanted Ge photoconductive antenna excited by a femtosecond Er:fibre laser
- Light: Science & Applications Vol. 9, Issue 2, Pages: 293-299(2020)
- Affiliations：
  
  1.Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
  2.Cfaed and Institute of Applied Physics, TU Dresden, 01062 Dresden, Germany
  3.Department of Physics and Center for Applied Photonics, University of Konstanz, 78457 Konstanz, Germany
- Author bio：
  
  Alexej Pashkin (a.pashkin@hzdr.de)
  Harald Schneider (h.schneider@hzdr.de)
- Funds：
- DOI：10.1038/s41377-020-0265-4
  CLC：
- Published：2020，
  
  Published Online：03 March 2020，
  
  Received：02 September 2019，
  
  Revised：31 January 2020，
  
  Accepted：18 February 2020
- Accepted：
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Singh, A. et al. Up to 70 THz bandwidth from an implanted Ge photoconductive antenna excited by a femtosecond Er:fibre laser. Light: Science & Applications, 9, 293-299 (2020).
DOI：

Singh, A. et al. Up to 70 THz bandwidth from an implanted Ge photoconductive antenna excited by a femtosecond Er:fibre laser. Light: Science & Applications, 9, 293-299 (2020). DOI： 10.1038/s41377-020-0265-4.

摘要

Abstract

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.

关键词

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references

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