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Reversing the pump dependence of a laser at an exceptional point

Author

Listed:
  • M. Brandstetter

    (Photonics Institute, Vienna University of Technology
    Center for Micro- and Nanostructures, Vienna University of Technology)

  • M. Liertzer

    (Institute for Theoretical Physics, Vienna University of Technology)

  • C. Deutsch

    (Photonics Institute, Vienna University of Technology
    Center for Micro- and Nanostructures, Vienna University of Technology)

  • P. Klang

    (Center for Micro- and Nanostructures, Vienna University of Technology
    Institute for Solid-State Electronics, Vienna University of Technology)

  • J. Schöberl

    (Institute for Analysis and Scientific Computing, Vienna University of Technology)

  • H. E. Türeci

    (Princeton University, Princeton)

  • G. Strasser

    (Center for Micro- and Nanostructures, Vienna University of Technology
    Institute for Solid-State Electronics, Vienna University of Technology)

  • K. Unterrainer

    (Photonics Institute, Vienna University of Technology
    Center for Micro- and Nanostructures, Vienna University of Technology)

  • S. Rotter

    (Institute for Theoretical Physics, Vienna University of Technology)

Abstract

When two resonant modes in a system with gain or loss coalesce in both their resonance position and their width, a so-called exceptional point occurs, which acts as a source of non-trivial physics in a diverse range of systems. Lasers provide a natural setting to study such non-Hermitian degeneracies, as they feature resonant modes and a gain material as their basic constituents. Here we show that exceptional points can be conveniently induced in a photonic molecule laser by a suitable variation of the applied pump. Using a pair of coupled microdisk quantum cascade lasers, we demonstrate that in the vicinity of these exceptional points the coupled laser shows a characteristic reversal of its pump dependence, including a strongly decreasing intensity of the emitted laser light for increasing pump power.

Suggested Citation

  • M. Brandstetter & M. Liertzer & C. Deutsch & P. Klang & J. Schöberl & H. E. Türeci & G. Strasser & K. Unterrainer & S. Rotter, 2014. "Reversing the pump dependence of a laser at an exceptional point," Nature Communications, Nature, vol. 5(1), pages 1-7, September.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5034
    DOI: 10.1038/ncomms5034
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    Cited by:

    1. Kaiwen Ji & Qi Zhong & Li Ge & Gregoire Beaudoin & Isabelle Sagnes & Fabrice Raineri & Ramy El-Ganainy & Alejandro M. Yacomotti, 2023. "Tracking exceptional points above the lasing threshold," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    2. A. Hashemi & K. Busch & D. N. Christodoulides & S. K. Ozdemir & R. El-Ganainy, 2022. "Linear response theory of open systems with exceptional points," Nature Communications, Nature, vol. 13(1), pages 1-12, December.

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