Lithography with UV-LED array for curved surface structure

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The technology to fabricate high-aspect ratio and micro curved surface structures is needed for optical device fabrication such as micro lens, light guiding device, and so on. In this study, micro curved surface structures were fabricated by using novel lithography technique with UV-LED array and rotary stage (Hanai et al. in Proceedings of the 22nd sensor symposium, pp 516-519, 2005). Smooth surface structures can be fabricated in this technique, because UV-LED which has wide directivity characteristics makes the difference of the UV dose. In addition, the structures can be formed with high uniformity in large area by only one exposure process, because rotation reduces the unevenness of exposure. This technique can control the shapes of structures by changing exposure time and applying gray scale mask method (Waits et al. in Sensors Actuat A 119:245-253, 2005). We fabricated structures of hemisphere, semi-cylinder, and semi-cone by using this technique. High-aspect ratio structures were obtained and they had smooth curved surface. Then, they were used for micro lens fabrication. By using molding technique, micro lenses of the UV curable resin were fabricated on the silicon wafer.

Original languageEnglish
Pages (from-to)1291-1297
Number of pages7
JournalMicrosystem Technologies
Volume14
Issue number9-11
DOIs
Publication statusPublished - 2008 Oct

Fingerprint

curved surfaces
Surface structure
Lithography
Light emitting diodes
Lenses
light emitting diodes
lithography
lenses
high aspect ratio
Aspect ratio
Fabrication
fabrication
gray scale
sensors
Sensors
directivity
Optical devices
hemispheres
Silicon wafers
Molding

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Instrumentation

Cite this

Lithography with UV-LED array for curved surface structure. / Suzuki, S.; Matsumoto, Yoshinori.

In: Microsystem Technologies, Vol. 14, No. 9-11, 10.2008, p. 1291-1297.

Research output: Contribution to journalArticle

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