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X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Linear light localization in two-dimensional fractional diffraction quasicrystals.

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    Linear light localization in photonic quasicrystals is achieved with fractional diffraction, enabling localization in shallower potentials. These localized modes are robust and insensitive to input beam position, offering tunable wave manipulation.

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    Area of Science:

    • Photonics
    • Wave Phenomena
    • Materials Science

    Background:

    • Light localization is a key phenomenon in photonic systems.
    • Photonic quasicrystals offer unique wave manipulation properties.
    • Fractional diffraction introduces non-local effects in wave propagation.

    Purpose of the Study:

    • To numerically investigate linear light localization in 2D photonic quasicrystals.
    • To explore the role of fractional diffraction on localization thresholds.
    • To assess the robustness of localized modes.

    Main Methods:

    • Numerical simulations of wave propagation in photonic quasicrystals.
    • Inclusion of fractional diffraction models.
    • Analysis of localization phenomena as a function of potential depth and symmetry order.

    Main Results:

    • Localization occurs above a critical potential depth, which decreases with higher symmetry.
    • Fractional diffraction significantly lowers localization thresholds, especially at lower diffraction orders.
    • Localized modes demonstrate robustness against variations in input beam position.

    Conclusions:

    • Fractional diffraction enhances light localization in photonic quasicrystals.
    • These systems provide a tunable platform for controlling wave localization.
    • Potential applications in precise wave manipulation and optical devices.