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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 9 — May. 1, 2006
  • pp: 4101–4106

Variable focus dielectric liquid droplet lens

Chih-Cheng Cheng, C. Alex Chang, and J. Andrew Yeh  »View Author Affiliations

Optics Express, Vol. 14, Issue 9, pp. 4101-4106 (2006)

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A liquid crystal droplet lens driven by the dielectrophoresis (DEP) force was demonstrated. The liquid crystal droplet lens was deformed by the DEP forces under non-uniform AC electric fields. Focal length, hysteresis and electrode design were studied. The focal length varied from 1.6mm to 2.6mm in the range of 0-200V at 1 kHz for electrode spacing of 50μm; that is, the tuning ratio of the focal length was about 60% in maximum. The hysteresis of contact angle was found to be less than 3° and it vanished after 1 minute at the rest state. As the electrode spacing over 200μm, the tuning ratios of the focal length dropped below 5%. The liquid crystal droplet lens that had numerical aperture of about 0.5 consumed power of about 0.1mW. Its response time was measured to be about 220ms.

© 2006 Optical Society of America

OCIS Codes
(220.3630) Optical design and fabrication : Lenses
(230.2090) Optical devices : Electro-optical devices
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Optical Devices

Original Manuscript: February 24, 2006
Revised Manuscript: April 12, 2006
Manuscript Accepted: April 18, 2006
Published: May 1, 2006

Chih-Cheng Cheng, C. Alex Chang, and J. Andrew Yeh, "Variable focus dielectric liquid droplet lens," Opt. Express 14, 4101-4106 (2006)

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  1. T. Nose, S Masuda and S Sato, "A liquid crystal microlens with hole-patterned electrodes on both substrates," Jpn. J. Appl. Phys. 31, 1643 (1992) [CrossRef]
  2. Y. Choi, J.-H. Park, J.-H Kim, and S.-D. Lee, "Fabrication of a focal length variable microlens array based on a nematic liquid crystal," Opt. Mater. 21, 643 (2003) [CrossRef]
  3. H Ren, Y H Fan and S T Wu, "Liquid-crystal microlens arrays using patterned polymer networks," Opt. Lett. 29, 1608 (2004). [CrossRef] [PubMed]
  4. B. Berge and J. Peseux, "Variable focal lens controlled by an external voltage: An application of electrowetting," Eur. Phys. J. E 3, 159 (2000). [CrossRef]
  5. S. Kwon and L. P. Lee, "Focal length control by microfabricated planar electrodes-based liquid lens (μPELL)," Transducers Eurosensors, Germany, 10-14 June, (2001)
  6. N. Chronis, G. L. Liu, K-H Jeong and L. P. Lee, "Tunable liquid-filled microlens array integrated with microfluidic network," Opt. Express 11, 2370 (2003) [CrossRef] [PubMed]
  7. M. Agarwal, R. A. Gunasekaran, P. Coane and K. Varahramyan, "Polymer-based variable focal length microlens system," J. Micromech. Microeng. 14, 1665 (2004) [CrossRef]
  8. F. Mugele and J-C Baret, "Electrowetting: from basics to applications," J. Phys.: Condens. Matter 17, R705 (2005) [CrossRef]
  9. E. Seyrat and R. A. Hayes, "Amorphous fluoropolymers as insulators for reversible low-voltage electrowetting," J. Appl. Phys. 90, 1383 (2001) [CrossRef]
  10. T. B. Jones, M. Gunji, M. Washizu, and M. J. Feldman, "Dielectrophoretic liquid actuation and nanodroplet formation," J. Appl. Phys. 89, 1441 (2001) [CrossRef]
  11. T. B. Jones, "Liquid dielectrophoresis on the microscale," J. Electrost. 51-52, 290 (2001) [CrossRef]
  12. S. Kwon and L. P. Lee, "Focal length control by microfabricated planar electrodes-based liquid lens (μPELL)," Transducers Eurosensors, Germany, 10-14 June, (2001)

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