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Superpixel-based spatial amplitude and phase modulation using a digital micromirror device.

Sebastianus A Goorden, Jacopo Bertolotti, Allard P Mosk

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    |August 5, 2014
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    Summary
    This summary is machine-generated.

    We developed a superpixel method for precise light beam control using a digital micromirror device (DMD). This technique allows independent modulation of light

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    Area of Science:

    • Optics and Photonics
    • Digital Optics
    • Light Beam Manipulation

    Background:

    • Precise control over light beam phase and amplitude is crucial for advanced optical applications.
    • Existing methods often face limitations in resolution, speed, or fidelity.

    Purpose of the Study:

    • To introduce a novel superpixel method for high-fidelity spatial phase and amplitude control of light beams.
    • To leverage the speed and resolution of digital micromirror devices (DMDs) for enhanced optical beam shaping.

    Main Methods:

    • Utilizing a digital micromirror device (DMD) combined with a spatial filter.
    • Implementing a superpixel approach by grouping micromirrors and applying low-pass filtering in the Fourier plane.
    • Independently modulating phase and amplitude at each superpixel.

    Main Results:

    • Achieved a measured fidelity of F = 0.98 for arbitrary phase and amplitude control at 8x8 pixels per diffraction-limited spot.
    • Calculated fidelity of F = 0.99993 for the LG10 orbital angular momentum mode using 768x768 DMD pixels.
    • Reduced errors by 50% and 18% compared to Lee holography, with ~5% light efficiency.

    Conclusions:

    • The superpixel method offers a significant advancement in spatial light modulation, providing high fidelity and speed.
    • This technique enhances control over light beams, outperforming current state-of-the-art methods.
    • Publicly available control software facilitates adoption and further research.