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Updated: Nov 5, 2025

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Controlled single-mode emission in quantum dot micro-lasers.

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    Researchers developed an efficient method for whispering-gallery-mode (WGM) manipulation, creating the first electrically driven single-mode quantum dot micro-ring (QDMR) lasers. These lasers achieve stable, single-mode emission tunable from 1300-1370 nm with a high side-mode suppression ratio.

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    Area of Science:

    • Photonics
    • Quantum Dot Technology
    • Optoelectronics

    Background:

    • Whispering-gallery-mode (WGM) resonators are crucial for integrated photonics.
    • Quantum dot micro-ring (QDMR) lasers offer potential for tunable, single-mode emission.
    • Efficient fabrication and electrical control of QDMR lasers remain challenging.

    Purpose of the Study:

    • To demonstrate an efficient fabrication method for WGM manipulation.
    • To report the first electrically driven single-mode QDMR lasers.
    • To achieve controllable single-mode emission in the 1300-1370 nm range.

    Main Methods:

    • Utilized self-assembled InAs/InAlGaAs quantum dot (QD) active layers.
    • Fabricated micro-ring resonators with deeply etched azimuthal gratings.
    • Investigated continuous-wave (CW) lasing characteristics under electrical drive.

    Main Results:

    • Achieved CW lasing with controllable single-mode emission wavelengths from 1300 nm to 1370 nm.
    • Obtained a record-high side-mode-suppression-ratio (SMSR) of 49 dB.
    • Demonstrated excellent single-mode lasing stability with thermal tunability of 0.092 nm/°C.

    Conclusions:

    • The developed fabrication method enables efficient WGM manipulation.
    • Electrically driven single-mode QDMR lasers are realized with high performance.
    • The technology is adaptable for various wavelength bands, enabling energy-efficient photonic integration.