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Related Experiment Video

Updated: Oct 12, 2025

Microfabrication of Implantable Optics Integrated in a Microstructured Imaging Window for Advanced In Vivo Imaging
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Design of a digitally switchable multifocal microlens array for integral imaging systems.

Xuan Wang, Hong Hua

    Optics Express
    |November 23, 2021
    PubMed
    Summary

    This study introduces a switchable multi-focal microlens array (MLA) to enhance depth of field in integral imaging. The novel design allows 3D scenes to be captured across a larger depth range.

    Area of Science:

    • Optics and Photonics
    • 3D Imaging Systems
    • Micro-optics

    Background:

    • Integral imaging systems often face limitations in depth of field, restricting the range of 3D scenes that can be accurately rendered or captured.
    • Extending the depth of field is crucial for improving the realism and usability of 3D display and capture technologies.

    Purpose of the Study:

    • To present the optical design of a digitally switchable multi-focal microlens array (MLA) for extending the depth of field in integral imaging.
    • To demonstrate the design considerations for a dual-focal microlens array and validate its performance through prototyping.

    Main Methods:

    • Designing a customized freeform multi-focal microlens array integrated with a programmable spatial light modulator.
    • Implementing a switching mechanism to alter the optical power of the MLA, enabling focus adjustments.

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  • Conducting interferometric measurements for surface profile validation and image contrast/resolution tests on a manufactured prototype.

    • Main Results:

    • A dual-focal microlens array with primary and secondary focal lengths of 4mm and 4.06mm was designed.
    • The switchable multi-focal MLA enables integral imaging systems to operate over a large depth range.
    • Interferometric measurements confirmed the surface profiles, and prototype tests validated image quality.

    Conclusions:

    • The digitally switchable multi-focal microlens array effectively extends the depth of field in integral imaging systems.
    • The proposed design offers a viable solution for capturing 3D scenes with enhanced depth perception.
    • Further development could lead to advanced 3D imaging applications with improved performance.