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Subwavelength direct-write nanopatterning using optically trapped microspheres.

Euan McLeod, Craig B Arnold

    Nature Nanotechnology
    |July 26, 2008
    PubMed
    Summary
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    Bessel beam laser trapping of microspheres enables direct-write subwavelength nanopatterning. This technique creates arbitrary nanoscale patterns with high accuracy, offering a potential high-throughput method for surface patterning.

    Area of Science:

    • Nanotechnology
    • Optical Physics
    • Materials Science

    Background:

    • Non-lithographic techniques offer nanoscale processing, but often face limitations in speed, usability, cost, and pattern versatility.
    • Optical techniques can achieve feature sizes smaller than the wavelength of light, but practical implementation challenges persist.

    Purpose of the Study:

    • To introduce a novel near-field direct-write subwavelength nanopatterning method using Bessel beam laser trapping of microspheres.
    • To demonstrate the capability of this technique for creating arbitrary nanoscale patterns with high precision.

    Main Methods:

    • Utilizing Bessel beam laser trapping to position microspheres near surfaces.
    • Employing the trapped microsphere as a near-field objective lens to focus a processing laser.

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  • Achieving subwavelength feature creation without active feedback control for microsphere-substrate spacing.

    • Main Results:

    • Demonstrated arbitrary pattern generation with minimum feature sizes of approximately 100 nm (less than one-third of the processing wavelength).
    • Achieved positioning accuracy better than 40 nm in both aqueous and chemical environments.
    • Maintained submicron spacing between the near-field objective and the substrate without active feedback.

    Conclusions:

    • Bessel beam laser trapping of microspheres provides a versatile and accurate method for near-field direct-write subwavelength nanopatterning.
    • The technique overcomes limitations of existing methods, enabling precise fabrication of nanoscale features.
    • Potential for high-throughput patterning exists with the integration of an array of optical traps.