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Fabrication of Refractive-index-matched Devices for Biomedical Microfluidics
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Optofluidic tunable microlens by manipulating the liquid meniscus using a flared microfluidic structure.

Xiaole Mao, Zackary I Stratton, Ahmad Ahsan Nawaz

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    Researchers developed a novel optofluidic microlens using fluid interfaces for tunable in-plane focusing. This simple design offers precise control and potential for lab-on-a-chip applications.

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    Area of Science:

    • Optofluidics
    • Microoptics
    • Materials Science

    Background:

    • Optofluidic devices integrate optical functions with microfluidics.
    • Tunable lenses are crucial for adaptable optical systems.
    • Interface properties between fluids can be exploited for optical manipulation.

    Purpose of the Study:

    • To design and demonstrate a novel in-plane tunable optofluidic microlens.
    • To utilize fluid interface properties for optical focusing.
    • To enable tunable focal length for lab-on-a-chip applications.

    Main Methods:

    • Fabrication of a polydimethylsiloxane (PDMS) microchannel with a flared structure.
    • Utilizing the interface between calcium chloride (CaCl2) solution and air.
    • Maintaining a constant contact angle of approximately 90°.
    • Characterizing beam focusing experimentally and via ray-tracing simulations.

    Main Results:

    • Demonstrated an in-plane tunable optofluidic microlens.
    • Achieved effective in-plane focusing due to a convex fluid interface and refractive index difference.
    • Validated focal points through experimental measurements and ray-tracing simulations.
    • Showcased tunable focal length by controlling the radius of curvature via fluid injection.

    Conclusions:

    • The developed microlens offers a simple, tunable, and low-fluid-usage solution.
    • Its in-plane focusing capability is suitable for micro-scale optical applications.
    • Potential applications include particle manipulation, flow cytometry, and optical trapping on-chip.