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Updated: Nov 5, 2025

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Enhanced emission from a single quantum dot in a microdisk at a deterministic diabolical point.

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    Controlling backscattering with two scatterers enables tunable cavity modes and enhanced quantum dot emission. This method offers flexible design for integrated photonic structures and light-matter interactions.

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    Area of Science:

    • Photonics
    • Quantum Optics
    • Materials Science

    Background:

    • Cavity modes are fundamental to photonic devices.
    • Controlling light-matter interactions is crucial for quantum technologies.

    Purpose of the Study:

    • To demonstrate controllable cavity modes using tunable backscattering.
    • To investigate enhanced light-matter interactions at specific points.

    Main Methods:

    • Utilizing two identical scatterers to control backscattering.
    • Employing a two-mode approximation and numerical simulations.
    • Investigating interactions between quantum dots and cavity modes.

    Main Results:

    • Periodic changes in backscattering coupling between degenerate cavity modes observed.
    • Single-peak cavity modes appearing periodically, indicating mode degeneracy at diabolical points.
    • Six-fold enhancement in quantum dot emission achieved at a diabolical point.

    Conclusions:

    • Tunable cavity modes can be achieved by controlling scatterer-induced backscattering.
    • Diabolical points offer a platform for enhanced light-matter interactions.
    • The method supports large-scale integration and flexible design for photonic devices.