28 March 2017 High-resolution topograms of fingerprints using multiwavelength digital holography
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Fingerprint analysis is a popular identification technique due to the uniqueness of fingerprints and the convenience of recording them. The quality of a latent fingerprint on a surface can depend on various conditions, such as the time of the day, temperature, and the composition of sweat. We first developed latent fingerprints on transparent and blackened glass slides by depositing 1000-nm-thick columnar thin films (CTFs) of chalcogenide glass of nominal composition Ge 28 Sb 12 Se 60 . Then, we used transmission-/reflection-mode multiwavelength digital holography to construct the topograms of CTF-developed fingerprints on transparent/blackened glass slides. The two wavelengths chosen were 514.5 and 457.9 nm, yielding a synthetic wavelength of 4.1624    μ m , which is sufficient to resolve pores of depths 1 to 2    μ m . Thus, our method can be used to measure the level-3 details that are usually difficult to observe with most other techniques applied to latent fingerprints.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Ujitha Abeywickrema, Partha Banerjee, Akash Kota, Stephen E. Swiontek, Akhlesh Lakhtakia, "High-resolution topograms of fingerprints using multiwavelength digital holography," Optical Engineering 56(3), 034117 (28 March 2017). https://doi.org/10.1117/1.OE.56.3.034117 . Submission: Received: 28 December 2016; Accepted: 13 March 2017
Received: 28 December 2016; Accepted: 13 March 2017; Published: 28 March 2017

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