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Tunable nanophotonic array traps with enhanced force and stability.

Fan Ye, Mohammad Soltani, James T Inman

    Optics Express
    |April 7, 2017
    PubMed
    Summary
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    We developed an enhanced nanophotonic standing wave array trap (nSWAT) for precise biomolecule manipulation. This improved optical trapping platform offers greater force, stiffness, and stability for broader applications.

    Area of Science:

    • Photonics
    • Nanotechnology
    • Biophysics

    Background:

    • On-chip optical interference platforms enable parallel biomolecule processing.
    • Nanophotonic standing wave array trap (nSWAT) devices offer single molecule manipulation capabilities.
    • Existing nSWAT devices utilize evanescent fields for trapping and microheaters for repositioning.

    Purpose of the Study:

    • To present a new generation of nSWAT devices with enhanced performance.
    • To improve optical trapping force, stiffness, and stability.
    • To ensure trap quality is robust against fabrication imperfections.

    Main Methods:

    • Systematic design approach for nSWAT devices.
    • Implementation on a silicon nitride photonic platform.
    • Operation at 1064 nm wavelength for reduced optical absorption in aqueous solutions.

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    Main Results:

    • Significant enhancement in optical trapping force, stiffness, and stability.
    • Demonstrated resistance of standing wave trap quality to fabrication imperfections.
    • Successful operation on a silicon nitride platform at 1064 nm.

    Conclusions:

    • The enhanced nSWAT devices offer improved performance for on-chip optical trapping.
    • These advancements broaden the applicability of nanophotonic trapping platforms.
    • The robust and enhanced nSWAT holds promise for more accessible single molecule manipulation and precision measurements.