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    Area of Science:

    • Nonlinear optics
    • Soliton physics
    • Theoretical physics

    Background:

    • Dark solitons are fundamental nonlinear wave solutions.
    • Controlling soliton propagation is crucial for optical technologies.
    • Optical event horizons offer novel interaction mechanisms.

    Purpose of the Study:

    • To demonstrate active control of dark soliton propagation using an optical event horizon and a probe wave.
    • To investigate the conversion of black solitons to gray solitons and their properties.
    • To explore the underlying nonlinear interaction mechanisms and their implications.

    Main Methods:

    • Utilizing an optical event horizon to interact with dark solitons.
    • Employing a weak probe wave for active control.
    • Performing linear-stability analysis to understand perturbation effects.
    • Investigating soliton collisional dynamics.

    Main Results:

    • Successfully controlled dark soliton propagation properties via an optical event horizon.
    • Achieved conversion of black solitons to gray solitons with tunable grayness and speed.
    • Demonstrated frequency-dependent phase angle control for gray solitons.
    • Revealed insights into the transition between integrable and non-integrable systems through analogue studies.

    Conclusions:

    • The optical event horizon is an effective technique for manipulating dark solitons.
    • Probe wave characteristics significantly influence soliton transformation and dynamics.
    • This work provides a new perspective on soliton control and system integrability.