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Proceedings Paper

Achromatic microlenses
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Paper Abstract

The optical properties of plano-convex refractive microlenses with low Fresnel Number (Typically FN < 10) are investigated. Diffraction effects at the lens stop limit the range of the effective focal length. The upper limit of the focal length is determined by the diffraction pattern of a pinhole with equal diameter. Refraction and diffraction have antagonist effects on the focal length when changing the wavelength of illumination. Diffraction effects at the lens stop are used to balance dispersion and to design microlens achromats. Gaussian beam propagation method has been used for simulation. The presented results are of relevance for applications like Shack Hartmann wavefront sensors or confocal microscopes, where microlenses with small apertures and long focal lengths are widely used.

Paper Details

Date Published: 21 April 2006
PDF: 8 pages
Proc. SPIE 6185, Micro-Optics, VCSELs, and Photonic Interconnects II: Fabrication, Packaging, and Integration, 618514 (21 April 2006); doi: 10.1117/12.661962
Show Author Affiliations
Patrick Ruffieux, Univ. of Neuchâtel (Switzerland)
Toralf Scharf, Univ. of Neuchâtel (Switzerland)
Hans Peter Herzig, Univ. of Neuchâtel (Switzerland)
Reinhard Voelkel, SUSS MicroOptics SA (Switzerland)
Kenneth J. Weible, SUSS MicroOptics SA (Switzerland)

Published in SPIE Proceedings Vol. 6185:
Micro-Optics, VCSELs, and Photonic Interconnects II: Fabrication, Packaging, and Integration
Hugo Thienpont; Mohammad R. Taghizadeh; Peter Van Daele; Jürgen Mohr, Editor(s)

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