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Substrate surface patterning by optical near field modulation around colloidal particles immersed in a liquid.

M Ulmeanu, P Petkov, D Ursescu

    Optics Express
    |December 2, 2016
    PubMed
    Summary

    Researchers explored optical near field enhancements using laser pulses around colloidal particles. Liquid immersion offers new control over sub-wavelength nanopatterning, enabling precise surface profile creation.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Optical near field enhancements around particles are key for nanopatterning.
    • Achieving sub-wavelength details in near-field distributions remains a significant challenge.

    Purpose of the Study:

    • To quantitatively analyze spatial modulation of optical near fields around colloidal particles.
    • To investigate the impact of liquid immersion on near field patterns and refractive index differences.

    Main Methods:

    • Utilized single 8 ps laser pulses at 355 nm and 532 nm.
    • Analyzed particles on silicon substrates in air and various liquid media.
    • Employed ray tracing and Mie scattering simulations for comparison with experimental observations.

    Main Results:

    • Demonstrated spatial modulation of optical near fields around individual and arrayed colloidal particles.
    • Showcased the effect of liquid immersion on near field patterns, including changes in refractive index magnitude and sign.
    • Achieved good agreement between simulations and experimentally observed surface patterns.

    Conclusions:

    • Liquid immersion provides enhanced control over optical near fields for nanopatterning.
    • This approach facilitates the creation of diverse sub-wavelength surface profiles using colloidal particles.
    • Encourages further research into modeling and applications of liquid-immersed colloidal particle systems.