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Related Concept Videos

X-ray Crystallography02:18

X-ray Crystallography

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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.
Diffraction
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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Related Experiment Video

Updated: Jun 10, 2025

Writing Bragg Gratings in Multicore Fibers
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Spatiotemporal Bragg gratings forming inside a nonlinear dispersive medium.

Junchi Zhang, W R Donaldson, Govind P Agrawal

    Optics Letters
    |October 15, 2024
    PubMed
    Summary

    Researchers created a spatiotemporal Bragg grating in nonlinear optical fibers using soliton pulses. This enables studying light-matter interactions and Anderson localization in photonic systems.

    Area of Science:

    • Nonlinear optics
    • Soliton physics
    • Photonic materials

    Background:

    • Nonlinear dispersive media, like silica fibers, support soliton propagation.
    • Bragg gratings are crucial for controlling light propagation.
    • Spatiotemporal control of optical properties is an active research area.

    Purpose of the Study:

    • To demonstrate the creation of a spatiotemporal Bragg grating in a nonlinear dispersive medium.
    • To theoretically model the grating and analyze its band structure.
    • To investigate light-matter interactions and Anderson localization phenomena.

    Main Methods:

    • Launching a periodic train of pump pulses as fundamental solitons.
    • Developing a theoretical model to describe the spatiotemporal Bragg grating.

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  • Simulating the interaction of a probe pulse with the grating.

    • Main Results:

    • Successfully created a spatiotemporal Bragg grating in nonlinear dispersive media.
    • Calculated the band structure of the grating.
    • Observed interactions of probe pulses within and outside momentum gaps.
    • Demonstrated the possibility of a photonic Anderson localization analog.

    Conclusions:

    • Spatiotemporal Bragg gratings can be formed in nonlinear dispersive media using solitons.
    • The theoretical model accurately describes the grating's properties and interactions.
    • Disordered spatiotemporal Bragg gratings exhibit Anderson localization, opening new avenues in photonics.