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Thresholdless quantum dot nanolaser.

Yasutomo Ota, Masahiro Kakuda, Katsuyuki Watanabe

    Optics Express
    |October 19, 2017
    PubMed
    Summary
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    Thresholdless lasing was achieved in a quantum dot nanolaser using cavity resonant excitation. This breakthrough verifies thresholdless operation and paves the way for highly energy-efficient nanolasers.

    Area of Science:

    • Laser physics
    • Quantum optics
    • Nanophotonics

    Background:

    • Thresholdless lasing is a long-standing challenge in laser science, requiring near-unity quantum efficiency for devices.
    • Identifying laser transitions in thresholdless systems remains debated due to featureless light output curves.

    Purpose of the Study:

    • To demonstrate and verify thresholdless lasing in a semiconductor quantum dot nanolaser.
    • To compare thresholdless and conventional thresholded lasing transitions within a single device.
    • To identify key elements for achieving energy-efficient nanolasers.

    Main Methods:

    • Utilized a semiconductor quantum dot nanolaser integrated with a photonic crystal nanocavity.
    • Employed cavity resonant excitation for focused carrier injection into high cavity field regions.

    Related Experiment Videos

  • Performed comparative analysis using conventional above-bandgap excitation to induce thresholded lasing.

    • Main Results:

    • Successfully demonstrated thresholdless lasing in the quantum dot nanolaser.
    • Verified thresholdless operation via cavity resonant excitation, enabling focused carrier injection.
    • Facilitated a direct comparison between thresholdless and thresholded lasing in the same device.

    Conclusions:

    • The study provides clear verification of thresholdless lasing in quantum dot nanolasers.
    • Cavity resonant excitation is identified as a key method for achieving thresholdless operation.
    • The findings pave the way for developing highly energy-efficient nanolasers.