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20 April 2012 Optical security device providing fingerprint and designed pattern indicator using fingerprint texture in liquid crystal
Keizo Nakayama, Junji Ohtsubo
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Optical Engineering, Vol. 51, Issue 4, 040506 (April 2012). https://doi.org/10.1117/1.OE.51.4.040506
Abstract
An optical security device providing the function of a fingerprint for authentication along with a designed pattern storage function has been proposed. The proposed device uses the random fingerprint texture in the chiral nematic phase of an ultraviolet-curable liquid crystal. Using photopolymerization along with a mask of the designed pattern, a unique pattern can be fixed in the shape of the designed pattern. The random patterns can be used as a fingerprint for such devices. This proposed device has the potential to be an optical security device and an authenticity or information indicator for the user.
© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2012/$25.00 © 2012 SPIE
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Keizo Nakayama and Junji Ohtsubo "Optical security device providing fingerprint and designed pattern indicator using fingerprint texture in liquid crystal," Optical Engineering 51(4), 040506 (20 April 2012). https://doi.org/10.1117/1.OE.51.4.040506
Published: 20 April 2012
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Cited by 20 scholarly publications and 3 patents.
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KEYWORDS
Information security
Liquid crystals
Polymers
Polarizers
Photography
Photopolymerization
Polarization
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