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Dual-insensitive zero refraction based on annular photonic crystals.

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    |April 27, 2022
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    Summary

    This study introduces a robust, non-accidental zero refraction (ZR) in photonic crystals. The novel design offers dual-insensitive ZR effects for both transverse magnetic and electric polarizations, enhancing optical beam tuning applications.

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    Area of Science:

    • Photonics and Metamaterials
    • Optical Engineering
    • Condensed Matter Physics

    Background:

    • Zero refraction (ZR) is a key breakthrough for optical beam tuning in double-zero-index photonic crystals (PCs).
    • Conventional ZR effects in PCs are highly sensitive to structural and refractive index parameters, limiting practical applications.
    • Enhancing the robustness of ZR designs is crucial for widespread adoption.

    Purpose of the Study:

    • To report a novel wave property for non-accidental zero refraction (ZR) in photonic crystals.
    • To demonstrate dual-insensitive ZR effects for both transverse magnetic (TM) and transverse electric (TE) polarizations.
    • To enhance the robustness of ZR designs against structural and refractive index variations.

    Main Methods:

    • Utilizing annular photonic crystals (PCs) to create a Dirac-like cone dispersion.
    • Analyzing low- and high-energy bands to achieve non-accidental ZR.
    • Investigating the influence of filling ratio on ZR performance.

    Main Results:

    • A non-accidental Dirac-like cone dispersion was successfully engineered.
    • Dual-insensitive ZR effects were achieved for both TM and TE polarizations.
    • The design exhibited simultaneous refractive index-insensitivity and structural-insensitivity.

    Conclusions:

    • The developed non-accidental ZR in annular PCs offers enhanced robustness compared to conventional methods.
    • This breakthrough paves the way for more reliable optical beam tuning applications.
    • The findings highlight the importance of structural design and filling ratio for robust photonic device performance.