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    Area of Science:

    • Optics
    • Photonics
    • Wavefront Shaping

    Background:

    • Wavefront shaping allows focusing light through scattering media.
    • The optical memory effect enables limited focus scanning.
    • Measuring the full transmission matrix (TM) offers complete control but is time-consuming.

    Purpose of the Study:

    • To develop a method for arbitrary focus scanning through scattering media.
    • To overcome the limitations of the optical memory effect range.
    • To reduce the measurement time compared to full TM characterization.

    Main Methods:

    • Introducing sparse field focusing (SFF).
    • Measuring only a subset of the transmission matrix.
    • Theoretical modeling and experimental validation.

    Main Results:

    • SFF enables focus scanning at any arbitrary position.
    • The scan range is not limited by the optical memory effect.
    • Experimental results align with theoretical predictions.

    Conclusions:

    • SFF provides a faster and more versatile alternative to full TM measurements.
    • This method is particularly useful when the optical memory effect is limited.
    • SFF is expected to advance imaging through scattering media.