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2D beam shaping via 1D spatial light modulator using static phase masks.

James E M Whitehead, Albert Ryou, Shane Colburn

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    |May 14, 2021
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    Summary
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    This study introduces a novel static phase-mask doublet for generating dynamic 2D electric fields, overcoming routing complexity in high-speed optical systems. This innovation enables faster, more efficient 2D spatial light modulators (SLMs).

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    Area of Science:

    • Optics and Photonics
    • Computational Electromagnetics

    Background:

    • Reconfigurable optical systems often face limitations due to complex electrical routing for dynamic 2D field generation.
    • Current spatial light modulator (SLM) technologies struggle with high-speed, arbitrary 2D wavefront control.

    Purpose of the Study:

    • To propose a gradient-based inverse-designed static phase-mask doublet for generating arbitrary 2D intensity wavefronts.
    • To overcome the routing complexity limitations in high-speed, reconfigurable optical systems.

    Main Methods:

    • Utilizing gradient-based inverse design to create a static phase-mask doublet.
    • Numerically simulating the mapping of a 1D array to a 2D spatial distribution using the designed phase mask.
    • Employing a 1D intensity spatial light modulator (SLM) to control the generated 2D fields.

    Main Results:

    • Demonstrated the capability to map each element of a 49-element 1D array to a distinct $7 \times 7$ 2D spatial distribution.
    • The proposed method significantly reduces the complexity of electrical control signals.
    • Validated the potential for arbitrary 2D intensity wavefront generation.

    Conclusions:

    • The static phase-mask doublet offers a simplified approach to generating dynamic 2D electric fields.
    • This method can enable high-speed, sub-wavelength 2D SLMs by leveraging new materials and pixel architectures.
    • Significant relaxation of routing complexity paves the way for next-generation optical systems.