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A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
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Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific...
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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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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.
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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Half-disordered photonic crystal slabs.

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    This summary is machine-generated.

    Disordered photonic crystals show asymmetric light transmission. Introducing vacancies on the incidence side boosts transmission through the photonic pseudogap, unlike when disorder is on the transmission side.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Photonic crystals offer control over light propagation.
    • Defects in photonic crystals can alter their optical properties.

    Purpose of the Study:

    • Investigate the impact of vacancies on light transmission in 2D triangular-lattice photonic crystals.
    • Analyze the asymmetry in transmission spectra when disorder is introduced on either the incidence or transmission side.

    Main Methods:

    • Studied optical transmission spectra of finite-thickness photonic crystal slabs.
    • Introduced randomly located vacancies (absent air holes) in a dielectric matrix.
    • Focused on structures with disorder on only one side (incidence or transmission).

    Main Results:

    • Vacancy-induced scattering significantly affects transmission.
    • High transmission within the photonic pseudogap observed for light incident on the disordered side.
    • Low transmission predicted throughout the pseudogap when disorder is on the transmission side, consistent with ideal structures.

    Conclusions:

    • Asymmetric light transmission is a key feature of disordered photonic crystals.
    • Vacancy placement critically determines light transmission characteristics within photonic pseudogaps.
    • These findings are crucial for designing photonic devices with tailored optical responses.