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Evanescent wave assisted nanomaterial coating.

Samir K Mondal1, Sudipta Sarkar Pal, Dharmadas Kumbhakar

  • 1CSIR-Central Scientific Instruments Organization, Chandigarh, India. samirmondal01@gmail.com

Applied Optics
|August 6, 2013
PubMed
Summary

This study introduces a new nanomaterial coating method using evanescent waves (EW) to self-assemble nanoparticles. This technique creates uniform, thin coatings for advanced optical fiber probes and plasmonic circuits.

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Area of Science:

  • Nanotechnology
  • Optics
  • Materials Science

Background:

  • Developing precise methods for nanomaterial coating is crucial for advanced optical and plasmonic devices.
  • Existing techniques may lack the resolution or control needed for uniform nanoparticle assembly.

Purpose of the Study:

  • To present a novel nanomaterial coating technique utilizing evanescent waves (EW).
  • To demonstrate the use of EW gradient force as an optical tweezer for nanoparticle self-assembly.
  • To validate the technique for creating uniform coatings on optical fibers.

Main Methods:

  • A laser-coupled, etched multimode optical fiber was used to generate EW.
  • The fiber was immersed in a silver/gold nanoparticle solution, and EW-assisted coating was performed.

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  • Nanoparticle self-assembly was driven by the EW gradient force as the solution evaporated.

    • Main Results:

    • Uniform and thin coatings of self-assembled nanoparticles were achieved around the etched section of the optical fiber.
    • The coating thickness was measured to be less than 200 nm.
    • The process demonstrated effective tweezing and self-assembly of nanoparticles via EW.

    Conclusions:

    • The developed EW-assisted coating technique offers a precise method for nanoparticle self-assembly.
    • This technique is suitable for fabricating surface-plasmon-resonance-based optical fiber probes.
    • The method holds potential for applications in creating various plasmonic circuits.