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Tracking exceptional points above the lasing threshold

Author

Listed:
  • Kaiwen Ji

    (Université Paris-Saclay)

  • Qi Zhong

    (Michigan Technological University)

  • Li Ge

    (CUNY
    CUNY)

  • Gregoire Beaudoin

    (Université Paris-Saclay)

  • Isabelle Sagnes

    (Université Paris-Saclay)

  • Fabrice Raineri

    (Université Paris-Saclay)

  • Ramy El-Ganainy

    (Michigan Technological University
    Michigan Technological University)

  • Alejandro M. Yacomotti

    (Université Paris-Saclay
    Université de Bordeaux)

Abstract

Recent studies on exceptional points (EPs) in non-Hermitian optical systems have revealed unique traits, including unidirectional invisibility, chiral mode switching and laser self-termination. In systems featuring gain/loss components, EPs are commonly accessed below the lasing threshold, i.e., in the linear regime. In this work, we experimentally demonstrate that EP singularities in coupled semiconductor nanolasers can be accessed above the lasing threshold, where they become branch points of a nonlinear dynamical system. Contrary to the common belief that unavoidable cavity detuning impedes the formation of EPs, here we demonstrate that such detuning is necessary for compensating the carrier-induced frequency shift, hence restoring the EP. Furthermore, we find that the pump imbalance at lasing EPs varies with the total pump power, enabling their continuous tracking. This work uncovers the unstable nature of EPs above laser threshold in coupled semiconductor lasers, offering promising opportunities for the realization of self-pulsing nanolaser devices and frequency combs.

Suggested Citation

  • 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.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43874-z
    DOI: 10.1038/s41467-023-43874-z
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    References listed on IDEAS

    as
    1. N. Ghofraniha & I. Viola & F. Di Maria & G. Barbarella & G. Gigli & L. Leuzzi & C. Conti, 2015. "Experimental evidence of replica symmetry breaking in random lasers," Nature Communications, Nature, vol. 6(1), pages 1-8, May.
    2. N. Ghofraniha & I. Viola & F. Di Maria & G. Barbarella & G. Gigli & L. Leuzzi & C. Conti, 2015. "Correction: Corrigendum: Experimental evidence of replica symmetry breaking in random lasers," Nature Communications, Nature, vol. 6(1), pages 1-1, May.
    3. Kyoung-Ho Kim & Min-Soo Hwang & Ha-Reem Kim & Jae-Hyuck Choi & You-Shin No & Hong-Gyu Park, 2016. "Direct observation of exceptional points in coupled photonic-crystal lasers with asymmetric optical gains," Nature Communications, Nature, vol. 7(1), pages 1-9, December.
    4. 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.
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    Cited by:

    1. Chitres Guria & Qi Zhong & Sahin Kaya Ozdemir & Yogesh S. S. Patil & Ramy El-Ganainy & Jack Gwynne Emmet Harris, 2024. "Resolving the topology of encircling multiple exceptional points," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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