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Coherent micromirror arrays.

Kebin Li, Uma Krishnamoorthy, Jonathan P Heritage

    Optics Letters
    |November 17, 2007
    PubMed
    Summary
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    Researchers developed a programmable spatial light modulator using micromirrors. This device can precisely control light phase, acting as either a diffraction grating or a single tilted mirror with suppressed higher-order diffraction.

    Area of Science:

    • Optics and Photonics
    • Micro-optics
    • Diffractive Optics

    Background:

    • Spatial light modulators (SLMs) are crucial for controlling light wavefronts.
    • Existing SLMs often face limitations in fidelity and programmability.
    • Micromirror arrays offer a promising platform for advanced optical modulation.

    Purpose of the Study:

    • To demonstrate a novel one-dimensional spatial light phase modulator.
    • To achieve high-fidelity, programmable spatial phase modulation using micromirrors.
    • To explore the dual functionality of the device as a diffraction grating and a tilted mirror.

    Main Methods:

    • Utilizing a coherent array of programmable micromirrors with rotation and elevation control.
    • Configuring a four-micromirror array to approximate a desired spatial phase profile.

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  • Implementing piecewise linear approximations for phase modulation.

    • Main Results:

    • Successfully demonstrated programmable, coherent spatial modulation.
    • Configured the array to function as a blazed diffraction grating, exhibiting five diffraction orders.
    • Showcased the ability to suppress higher-order diffraction by adjusting mirror elevations to mimic a single tilted mirror.

    Conclusions:

    • The developed micromirror-based spatial light modulator offers versatile and high-fidelity phase control.
    • The device can be dynamically reconfigured for different optical functions, such as diffraction or specular reflection.
    • This technology holds potential for applications requiring precise wavefront manipulation.