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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.
X-ray Crystallography02:18

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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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Poincaré sphere analysis of liquid crystal optics.

Applied optics·2010
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Total-reflection liquid-crystal electrooptic device.

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Related Experiment Video

Updated: Jun 16, 2026

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
06:26

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

Diffraction from a liquid crystal phase grating.

R A Kashnow, J E Bigelow

    Applied Optics
    |February 4, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Light diffraction in liquid crystals shows a unique pattern at electrohydrodynamic instability thresholds. The diffraction pattern reveals a spatial frequency component at half the expected value due to grating traversals.

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    Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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    Area of Science:

    • Optics
    • Condensed Matter Physics
    • Materials Science

    Background:

    • Nematic liquid crystals exhibit complex optical properties.
    • Electrohydrodynamic instabilities modify liquid crystal structures.
    • Diffraction gratings are crucial for light manipulation.

    Purpose of the Study:

    • To analyze light diffraction by a perturbed optic axis in nematic liquid crystals.
    • To investigate phenomena occurring at electrohydrodynamic instability thresholds.
    • To understand the resulting diffraction patterns and their origins.

    Main Methods:

    • Theoretical discussion of light diffraction.
    • Analysis of sinusoidal perturbations in the optic axis.
    • Correlation with experimental electrohydrodynamic instability thresholds.

    Main Results:

    • Observed diffraction pattern exhibits a contribution at half the expected spatial frequency.
    • This phenomenon is linked to nonorthogonal traversals of the thick phase grating.
    • The findings provide insights into light-matter interactions in dynamic liquid crystal systems.

    Conclusions:

    • The study reveals a novel diffraction feature in liquid crystals under specific conditions.
    • Nonorthogonal grating traversals are identified as the cause of the observed frequency shift.
    • This contributes to understanding light manipulation in responsive materials.