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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 25 — Sep. 1, 2010
  • pp: 4763–4766

Fingerprint sensor using a polymer dispersed liquid crystal holographic lens

Ying Jie and Zheng Jihong  »View Author Affiliations


Applied Optics, Vol. 49, Issue 25, pp. 4763-4766 (2010)
http://dx.doi.org/10.1364/AO.49.004763


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Abstract

We used a polymer dispersed liquid crystal material holographic lens in a fingerprint sensor, which reduced the total size of the sensor and improved image quality. The beam carrying fingerprint information was diffracted by the holographic lens and converged onto the complementary metal-oxide semiconductor image sensor directly, which omitted the traditional lens or fiber taper. The phenomenon that the image quality is poor when the finger is too dry or wet was explained based on the evanescent wave theory. The total size of the device was 50 mm × 25 mm × 30 mm . The fingerprint image had a contrast of 250 : 1 and a resolution of 800 dots /in.

© 2010 Optical Society of America

OCIS Codes
(110.2970) Imaging systems : Image detection systems
(120.1880) Instrumentation, measurement, and metrology : Detection

ToC Category:
Imaging Systems

History
Original Manuscript: May 7, 2010
Revised Manuscript: July 8, 2010
Manuscript Accepted: July 26, 2010
Published: August 26, 2010

Virtual Issues
Vol. 5, Iss. 13 Virtual Journal for Biomedical Optics

Citation
Ying Jie and Zheng Jihong, "Fingerprint sensor using a polymer dispersed liquid crystal holographic lens," Appl. Opt. 49, 4763-4766 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-25-4763

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