Generation of submicrometer structures by photolithography using arrays of spherical microlenses

Ming Hsien Wu, Cheolmin Park, George M. Whitesides

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

This paper describes the fabrication of arrays of spherical microlenses by self-assembly of microspheres and the use of these arrays for nearfield photolithography to generate repetitive microstructures in photoresist. We used these arrays of microspheres to fabricate two types of elastomeric membranes: (i) membranes that have microspheres embedded in their surface and (ii) membranes that have hemispherical wells in their surface. Both types of membranes act as amplitude masks that pattern the intensity of illumination in the near field incident on the photoresist. Microspheres in the first type of membrane act as convergent lenses that generate recessed microstructures in positive photoresist. Hemispherical wells in the second type of membrane act as divergent lenses that produce protrusive microstructures in positive photoresist. This method can generate dense, regular arrays of microstructures with a variety of profiles - circular or hexagonal holes, circular posts, hollow posts, and cones - depending on the sizes and refractive indices of the spherical lenses and the distance between the lenses and the photoresist. This technique provides a simple route to large areas (>4 cm2) of repetitive, simple microstructures.

Original languageEnglish
Pages (from-to)304-309
Number of pages6
JournalJournal of Colloid and Interface Science
Volume265
Issue number2
DOIs
Publication statusPublished - 2003 Sep 15

Fingerprint

Microlenses
Photolithography
Photoresists
Membranes
Microspheres
Lenses
Microstructure
Self assembly
Cones
Masks
Refractive index
Lighting
Fabrication

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Cite this

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Generation of submicrometer structures by photolithography using arrays of spherical microlenses. / Wu, Ming Hsien; Park, Cheolmin; Whitesides, George M.

In: Journal of Colloid and Interface Science, Vol. 265, No. 2, 15.09.2003, p. 304-309.

Research output: Contribution to journalArticle

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