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Unsymmetric Bending01:18

Unsymmetric Bending

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Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
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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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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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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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Related Experiment Video

Updated: Jun 16, 2025

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Helically twisted nonlinear photonic crystals.

Chen Yu, Shan Liu, Tianxiang Xu

    Optics Letters
    |August 15, 2024
    PubMed
    Summary

    Researchers created helical nonlinear photonic crystals to control light

    Area of Science:

    • Nonlinear optics
    • Materials science
    • Photonics

    Background:

    • Nonlinear photonic crystals enable control over light properties.
    • Helical structures offer unique ways to manipulate light's orbital angular momentum (OAM).

    Purpose of the Study:

    • To fabricate and investigate a double-helix nonlinear photonic crystal structure.
    • To demonstrate the control of topological charge in generated vortex beams.
    • To verify orbital angular momentum conservation during nonlinear optical processes.

    Main Methods:

    • Fabrication of Sr0.61Ba0.39Nb2O6 crystals with a helical second-order nonlinear coefficient (χ(2)) using infrared femtosecond laser poling.
    • Generation of a second-harmonic vortex beam from a Gaussian pump beam using the double-helix structure.

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    Main Results:

    • Successfully imprinted quasi-orbital angular momentum onto photons.
    • Generated a second-harmonic vortex beam without phase singularity.
    • Verified the conservation law for orbital angular momentum in the second-harmonic generation process.
    • Demonstrated full compensation of the pump photons' topological charge by the double-helix structure.

    Conclusions:

    • Helical nonlinear photonic crystals provide flexible control over light's OAM at new frequencies.
    • This technology has significant potential for applications in nonlinear wavefront shaping and quantum photonics, including multidimensional entanglement of photons.