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Mode selection in InAs quantum dot microdisk lasers using focused ion beam technique.

A A Bogdanov, I S Mukhin, N V Kryzhanovskaya

    Optics Letters
    |September 15, 2015
    PubMed
    Summary

    Focused ion beam etching of grooves on indium arsenide (InAs) quantum dot microdisk lasers suppresses specific radial modes. This technique enhances mode spacing, enabling control over laser emission without compromising quality.

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    Area of Science:

    • Optoelectronics
    • Semiconductor Lasers
    • Nanotechnology

    Background:

    • Microdisk lasers offer compact and efficient light sources.
    • Controlling radial modes in microdisk lasers is crucial for specific applications.
    • Indium arsenide (InAs) quantum dots are promising gain media for lasers.

    Purpose of the Study:

    • To investigate the effect of focused ion beam (FIB) etched radial grooves on InAs quantum dot microdisk lasers.
    • To demonstrate the suppression of specific radial modes using surface gratings.
    • To analyze the impact on mode spacing and quality factor.

    Main Methods:

    • Fabrication of InAs quantum dot microdisk lasers.
    • Surface modification using focused ion beam (FIB) etching to create radial grooves.
    • Optical pumping and spectral analysis at cryogenic temperatures (78 K).
    • Numerical simulations for mode analysis.

    Main Results:

    • Radial grooves effectively suppress specific radial modes of the microdisk laser.
    • Complete suppression of higher-order radial modes, leaving only the fundamental mode, was achieved.
    • A sixfold increase in mode spacing (from 2.5 nm to 15.5 nm) was observed for an 8 μm diameter microdisk.
    • The dominant mode quality factor remained largely unaffected by the etching process.
    • Experimental results showed good agreement with numerical simulations.

    Conclusions:

    • Focused ion beam etching of radial grooves is a viable method for controlling and enhancing mode selectivity in InAs quantum dot microdisk lasers.
    • This technique allows for precise tuning of laser output characteristics, including mode spacing and suppression.
    • The demonstrated method offers a pathway to developing advanced microcavity laser devices with tailored spectral properties.