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Close-packed hemispherical microlens array from two-dimensional ordered polymeric microspheres.

Hye Jin Nam1, Duk-Young Jung, Gi-Ra Yi

  • 1Department of Chemistry-BK21, Institute of Basic Sciences, Sungkyunkwan University, Suwon 440-746, Korea.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 9, 2006
PubMed
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This study presents a simple soft-lithography technique to create hexagonal microlens arrays using polystyrene microspheres. This method offers a reproducible way to fabricate nanoscale embossed layers for various applications.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Microlens arrays are crucial optical components.
  • Fabricating ordered microlens arrays often requires complex, multi-step processes.
  • Soft-lithography offers a versatile platform for micro/nanofabrication.

Purpose of the Study:

  • To develop a facile and reproducible method for fabricating hexagonally close-packed microlens arrays.
  • To utilize colloidal self-assembly for creating micro/nanoscale optical structures.
  • To demonstrate a scalable fabrication route for embossed thin layers.

Main Methods:

  • Spin-casting monodisperse polystyrene microspheres to form a colloidal monolayer template.
  • Using the colloidal monolayer to create polydimethylsiloxane (PDMS) molds with hexagonal air voids.

Related Experiment Videos

  • Imprinting ultraviolet-curable photopolymers on glass substrates using the PDMS molds to form microlens arrays.

    • Main Results:

    • Successfully fabricated hexagonally close-packed microlens arrays.
    • PDMS molds exhibited hemispherical air voids with a depth of 103 nm.
    • Replicated microlenses had a height of 95 nm with narrow size distribution and good reproducibility.
    • Demonstrated control over feature size by varying microsphere diameter.

    Conclusions:

    • The developed soft-lithography method is a reliable and efficient route for fabricating microlens arrays.
    • This technique avoids complex multi-step engineering processes.
    • The method is scalable for centimeter-scale areas and adaptable for fabricating embossed layers from nanometers to micrometers.