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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
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Related Experiment Video

Updated: Apr 25, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

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Backscatter analysis based algorithms for increasing transmission through highly scattering random media using

Curtis Jin, Raj Rao Nadakuditi, Eric Michielssen

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |August 15, 2014
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed new algorithms to enhance signal transmission through scattering media using only phase modulation. These methods achieve high transmission rates, crucial for applications like biomedical imaging, by analyzing backscattered light.

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    Area of Science:

    • Wave physics
    • Photonics
    • Random media optics

    Background:

    • Strongly backscattering random media typically impede wave transmission.
    • Perfectly transmitting wavefronts, with near-unity transmission, have been theoretically and experimentally observed.
    • Synthesizing these wavefronts usually requires spatial amplitude and phase modulation.

    Purpose of the Study:

    • To investigate transmission enhancement in random media using phase-only modulated wavefronts.
    • To develop practical algorithms for increasing transmission without measuring transmitted fields, relevant for biomedical applications.
    • To analyze the theoretical and numerical limits of phase-only modulation for wave transmission.

    Main Methods:

    • Development of iterative and non-iterative algorithms utilizing backscatter analysis for transmission enhancement.
    • Theoretical analysis based on the properties of perfectly transmitting eigen-wavefronts and singular vectors of the transmission matrix.
    • Numerical simulations in 2D using spectrally accurate solvers for random media composed of numerous scatterers.

    Main Results:

    • Non-iterative algorithms predict at least ~78.5% transmission with high probability under specific conditions.
    • Iterative algorithms demonstrate rapid convergence, achieving ~70% transmission with significantly fewer backscatter measurements compared to non-iterative methods.
    • Phase-only modulation with a given number of modes outperforms amplitude and phase modulation with half the modes.

    Conclusions:

    • Phase-only modulation is a viable and efficient strategy for enhancing wave transmission through strongly scattering media.
    • The developed algorithms offer practical solutions for applications where transmitted field measurement is impossible.
    • The findings validate the potential of phase-only wavefront shaping for overcoming scattering challenges in complex media.