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Partially directional microdisk laser with two Rayleigh scatterers.

Minkyung Kim, Kyungmook Kwon, Jaeho Shim

    Optics Letters
    |July 1, 2014
    PubMed
    Summary
    This summary is machine-generated.

    We developed a tunable semiconductor laser that directs light asymmetrically. By altering tiny scatterers on its edge, we control light direction and chirality for whispering gallery modes.

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    Area of Science:

    • Photonics
    • Semiconductor Lasers
    • Nanophotonics

    Background:

    • Whispering gallery mode (WGM) lasers are efficient but typically lack directionality.
    • Controlling light emission direction in microdisk lasers is crucial for integrated photonic devices.

    Purpose of the Study:

    • To demonstrate a partially directional microdisk semiconductor laser.
    • To investigate the control of directionality and chirality of laser modes using boundary perturbations.

    Main Methods:

    • Utilized subwavelength-scale boundary perturbations (Rayleigh scatterers) on a microdisk perimeter.
    • Employed numerical simulations and experimental investigations.
    • Focused on wavelength-scale microdisk resonators with an azimuthal mode number of 5.

    Main Results:

    • Achieved asymmetric backscattering of counterpropagating WGMs.
    • Demonstrated fine-tuning and partial control of laser mode directionality and chirality.
    • Showed that scatterer dimensions, shape, and positions influence directionality.

    Conclusions:

    • Boundary perturbations offer a novel method for controlling directionality in microdisk lasers.
    • This approach provides an alternative to optical bistability for directional light emission.
    • The findings enable the development of advanced tunable and directional microphotonic devices.