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Phase manipulation in reflective phase gradient photonic crystals.

Xiao Zhang, Jie Liu, Liang Liang

    Optics Express
    |November 14, 2024
    PubMed
    Summary

    Phase gradient photonic crystals (PGPCs) offer versatile phase manipulation for optical devices. These PGPCs enable functions like deflection and focusing with constant reflection magnitude, simplifying design and ensuring broadband applicability.

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    Area of Science:

    • Photonics and Metamaterials
    • Electromagnetics and Optics

    Background:

    • Phase gradient photonic crystals (PGPCs) are emerging as key components for advanced phase manipulation.
    • Traditional metasurfaces often rely on structural resonance, posing design complexities.

    Purpose of the Study:

    • To introduce and validate PGPCs as a novel platform for arbitrary electromagnetic functions.
    • To highlight the design advantages of PGPCs over existing metasurface technologies.

    Main Methods:

    • Theoretical modeling of phase variation through edge configuration in PGPCs.
    • Experimental validation of PGPC performance, focusing on deflection and focusing capabilities.
    • Analysis of reflection magnitude and angular stability within the Bragg gap.

    Main Results:

    • PGPCs achieve phase manipulation via simple edge configuration, independent of structural resonance.
    • Constant reflection magnitude (1) in the Bragg gap simplifies PGPC design.
    • Reflective PGPC deflectors demonstrate robust angular stability and broadband frequency operation.

    Conclusions:

    • PGPCs present a powerful and convenient approach for optical phase manipulation.
    • This technology facilitates the development of innovative optical devices with unique functionalities.
    • The findings pave the way for novel optical platforms utilizing PGPCs.