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Related Concept Videos

Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

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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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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

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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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Related Experiment Video

Updated: Mar 7, 2026

Trapping of Micro Particles in Nanoplasmonic Optical Lattice
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Trapped spoof surface plasmons with structured defects in textured closed surfaces.

Hong-Wei Wu, Hua-Jun Chen, Hui-Ying Fan

    Optics Letters
    |February 16, 2017
    PubMed
    Summary

    Researchers can trap spoof surface plasmons (SPs) using defect units on textured surfaces. The frequency and location of these trapped SPs can be precisely controlled for potential applications.

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    Area of Science:

    • Condensed Matter Physics
    • Electromagnetism
    • Nanophotonics

    Background:

    • Periodic textured surfaces support spoof surface plasmons (SPs), which are electromagnetic waves confined to the surface.
    • Controlling the behavior of SPs is crucial for developing advanced photonic devices.
    • Current methods for manipulating SPs often lack fine-tuning capabilities or broad applicability.

    Purpose of the Study:

    • To demonstrate a novel method for trapping spoof surface plasmons (SPs) using defect units on closed surfaces.
    • To show that the resonant frequency and location of trapped SPs can be precisely tuned.
    • To explore the potential of these engineered structures for applications in optical switching and data storage.

    Main Methods:

    • Fabrication of periodic textured closed surfaces with integrated defect units.
    • Characterization of spoof surface plasmon (SP) trapping using tailored defect dimensions.
    • Design and simulation of graded defect structures for broadband SP trapping.

    Main Results:

    • A defect unit effectively traps spoof surface plasmons (SPs) to a deep subwavelength scale.
    • The resonant frequency of trapped SPs is freely tunable by altering defect unit dimensions.
    • Multiple defect units enable frequency-selective SP trapping at desired locations, and graded defects allow ultrawide spectral band trapping.

    Conclusions:

    • Engineered defect structures provide precise control over spoof surface plasmon (SP) confinement and frequency.
    • Tunable SP trapping opens possibilities for creating novel optical switches and data storage devices.
    • The demonstrated designer structures are promising for manipulating electromagnetic waves in microwave and terahertz frequencies.