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Wavefront shaping of Bloch surface waves enabled by planar Bragg array couplers.

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    Researchers developed Bragg array couplers to precisely control Bloch surface waves (BSWs) for on-chip photonics. This breakthrough enables advanced light manipulation and robust beam generation for integrated photonic devices.

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    Area of Science:

    • Photonics
    • Surface Wave Physics
    • Nanophotonics

    Background:

    • Controlling surface wave wavefronts is vital for on-chip photonics.
    • Arbitrary manipulation of Bloch surface waves (BSWs) presents significant challenges.

    Purpose of the Study:

    • To design and demonstrate planar Bragg array couplers for arbitrary manipulation of BSW wavefronts.
    • To establish a general platform for surface-wave manipulation in integrated photonic devices.

    Main Methods:

    • Fabrication of planar Bragg array couplers.
    • Experimental demonstration of BSW wavefront shaping using laser incidence and momentum mismatch compensation.
    • Utilizing leakage radiation microscopy for imaging generated BSWs.

    Main Results:

    • Precise control over the initial phase of excited BSWs.
    • Efficient excitation of transverse magnetic polarized BSWs.
    • Successful generation and observation of BSW focusing, cosine-Gauss beams, and accelerating beams.
    • Demonstration of self-healing properties and robustness against perturbations.

    Conclusions:

    • Bragg array couplers provide a versatile platform for BSW wavefront manipulation.
    • This method facilitates the development of highly integrated on-chip photonic devices.
    • The demonstrated control opens new avenues for advanced photonic applications.