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    Researchers can now shape light beams in 3D using ultrasound waves. This novel technique allows for in situ control of optical patterns, with applications in microscopy and biological imaging.

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    Area of Science:

    • Optics and Photonics
    • Acoustics and Ultrasonics
    • Biophysics

    Background:

    • Controlling light beams in three dimensions is crucial for advanced optical applications.
    • Existing methods for optical beam shaping often lack in situ reconfigurability or require complex setups.

    Purpose of the Study:

    • To demonstrate a novel method for in situ 3D spatial and temporal shaping of optical beams using ultrasound interference patterns.
    • To explore the potential of this technique for creating complex light patterns and its applications in various scientific fields.

    Main Methods:

    • Utilizing custom-designed cylindrical ultrasonic arrays to generate 3D reconfigurable interference patterns of ultrasound waves.
    • Inducing a modulated refractive index pattern within a medium using ultrasonic pressure waves.
    • Synchronizing lightwave and ultrasound propagation for precise control over optical patterns.

    Main Results:

    • Successfully sculpted complex light patterns, including dipole and quadrupole shapes, in situ.
    • Demonstrated the ability to scan optical patterns in radial and azimuthal directions through combined theory and experiment.
    • Showcased selective confinement of light to specific extrema of the ultrasound pressure profile.
    • Extended the technique to define spatial light patterns in turbid media.

    Conclusions:

    • The developed technique offers a powerful new approach for dynamic, in situ 3D optical beam sculpting using ultrasound.
    • This method holds significant promise for advancing fields such as biological imaging, manipulation, holography, and microscopy.