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Optical memory effect in square multimode fibers.

Antonio M Caravaca-Aguirre, Adrien Carron, Sylvain Mezil

    Optics Letters
    |October 1, 2021
    PubMed
    Summary
    This summary is machine-generated.

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    Researchers observed a translational optical memory effect in square-core optical fibers. This effect causes light patterns to shift in four directions due to the fiber

    Area of Science:

    • Optics and Photonics
    • Waveguide Technology
    • Materials Science

    Background:

    • Optical memory effects are crucial for information processing and storage.
    • Multimode fibers typically exhibit complex light scattering, making predictable light manipulation challenging.
    • Square-core fibers offer unique symmetry properties not found in circular-core fibers.

    Purpose of the Study:

    • To experimentally demonstrate and theoretically model the translational optical memory effect in square-core multimode fibers.
    • To investigate the influence of waveguide symmetry on light propagation and output patterns.
    • To quantify the shift distances and fiber lengths over which the effect is observable.

    Main Methods:

    • Experimental setup using 532-nm coherent light source.

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  • Utilizing a square-core step-index multimode fiber.
  • Analyzing output speckle pattern shifts in response to input beam displacements.
  • Developing a theoretical model based on a perfectly reflective square waveguide.

    • Main Results:

    • Observed a translational optical memory effect where input shifts result in output shifts along four directions.
    • The symmetry of the square core is identified as the cause of this directional shifting.
    • The effect was demonstrated for input shift distances up to 10 µm.
    • The phenomenon persisted after propagation through several centimeters of fiber.

    Conclusions:

    • Square-core multimode fibers exhibit a unique translational optical memory effect.
    • The observed effect is governed by the waveguide's symmetry properties.
    • This finding opens possibilities for novel optical manipulation and sensing applications in square-core fiber systems.