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Related Concept Videos

Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Determination of Crystal Structures01:29

Determination of Crystal Structures

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...
X-ray Crystallography02:18

X-ray Crystallography

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
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Related Experiment Video

Updated: Jun 20, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
10:39

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

Published on: October 11, 2016

Diffraction of a light beam by doubly periodic structures.

M C Gupta, S T Peng

    Optics Letters
    |September 25, 2009
    PubMed
    Summary

    Light diffraction by dual gratings separated by a thin film reveals numerous diffracted beams. These beams arise from evanescent field interactions between the gratings, enhancing optical phenomena.

    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Diffraction is a fundamental wave phenomenon.
    • Periodic structures are key in optical applications.
    • Thin films can modify light interactions.

    Purpose of the Study:

    • Investigate light diffraction by double grating structures.
    • Analyze the role of evanescent fields in light interaction.
    • Characterize the resulting diffracted beams.

    Main Methods:

    • Theoretical modeling of light diffraction.
    • Experimental verification using fabricated structures.
    • Analysis of optical field interactions.

    Main Results:

    • Observed numerous diffracted beams beyond simple grating predictions.

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    Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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  • Confirmed the significant contribution of evanescent field coupling.
  • Demonstrated a complex diffraction pattern influenced by film thickness and grating separation.

    • Conclusions:

    • Double gratings with thin films exhibit rich diffraction behavior.
    • Evanescent field interactions are crucial for understanding these phenomena.
    • Potential applications in advanced optical devices and sensors.