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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 4 — Feb. 16, 2009
  • pp: 2487–2499

Tunable liquid microlens arrays in electrode-less configuration and their accurate characterization by interference microscopy

L. Miccio, A. Finizio, S. Grilli, V. Vespini, M. Paturzo, S. De Nicola, and Pietro Ferraro  »View Author Affiliations

Optics Express, Vol. 17, Issue 4, pp. 2487-2499 (2009)

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A special class of tunable liquid microlenses is presented here. The microlenses are generated by an electrowetting effect under an electrode-less configuration and they exhibit two different regimes that are named here as separated lens regime (SLR) and wave-like lens regime (WLR). The lens effect is induced by the pyroelectricity of polar dielectric crystals, as was proved in principle in a previous work by the same authors (S. Grilli et al., Opt. Express 16, 8084, 2008). Compared to that work, the improvements to the experimental set-up and procedure allow to reveal the two lens regimes which exhibit different optical properties. A digital holography technique is used to reconstruct the transmitted wavefront during focusing and a focal length variation in the millimetre range is observed. The tunability of such microlenses could be of great interest to the field of micro-optics thanks to the possibility to achieve focus tuning without moving parts and thus favouring the miniaturization of the optical systems.

© 2009 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(090.0090) Holography : Holography
(160.3730) Materials : Lithium niobate
(220.3630) Optical design and fabrication : Lenses

ToC Category:
Adaptive Optics

Original Manuscript: October 24, 2008
Revised Manuscript: December 12, 2008
Manuscript Accepted: December 19, 2008
Published: February 6, 2009

L. Miccio, A. Finizio, S. Grilli, V. Vespini, M. Paturzo, S. De Nicola, and Pietro Ferraro, "Tunable liquid microlens arrays in electrode-less configuration and their accurate characterization by interference microscopy," Opt. Express 17, 2487-2499 (2009)

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