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Amplitude stabilization and active control of a terahertz quantum cascade laser with a graphene loaded split-ring-resonator array

Research output: Contribution to journalJournal article

  • Binbin Wei
  • Stephen Kindness
  • Nikita Almond
  • Robert Wallis
  • Y. Wu
  • Yuan Ren
  • S. C. Shi
  • Philipp Braeuninger-Weimer
  • Stephan Hofmann
  • Harvey E. Beere
  • David Ritchie
  • Riccardo Degl'Innocenti
Article number201102
<mark>Journal publication date</mark>15/05/2018
<mark>Journal</mark>Applied Physics Letters
Issue number20
Number of pages4
<mark>Original language</mark>English


We demonstrate the amplitude stabilization of a 2.85 THz quantum cascade laser with a graphene loaded split-ring-resonator array, acting as an external amplitude modulator. The transmittance of the modulator can be actively changed by modifying the graphene conductivity via electrostatic back-gating. The modulator operates at room temperature and is capable of actively modulating the quantum cascade laser power level and thus stabilizing the power output via a proportional-integral-derivative feedback control loop. The stability was enhanced by more than 10 times through actively tuning the modulation. Furthermore, this approach can be used to externally control the laser power with a high level of stability

Bibliographic note

Copyright 2018 American Institute of Physics. The following article appeared in Applied Physics Letters, 112, (20) 2018 and may be found at http://dx.doi.org/10.1063/1.5027687 This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.