Mass-producible microscopic computer-generated holograms: microtags

We have developed a method for encoding phase and amplitude in microscopic computer-generated holograms (microtags) for security applications. An 8 x 8 cell phase-only and an 8 x 8 cell phase-and-amplitude microtag design has been exposed in photoresist by the extreme-ultraviolet (13.4-nm) lithograp...

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Bibliographic Details
Published inOptics letters Vol. 21; no. 23; p. 1951
Main Authors Descour, M R, Sweatt, W C, Ray-Chaudhuri, A K, Krenz, K D, Warren, M E, Kravitz, S H, Tichenor, D A, Stulen, R H, Love, T L
Format Journal Article
LanguageEnglish
Published United States 01.12.1996
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Summary:We have developed a method for encoding phase and amplitude in microscopic computer-generated holograms (microtags) for security applications. An 8 x 8 cell phase-only and an 8 x 8 cell phase-and-amplitude microtag design has been exposed in photoresist by the extreme-ultraviolet (13.4-nm) lithography tool developed at Sandia National Laboratories. Each microtag measures 80 microm x 160 microm and contains features that are 0.2 microm wide. Fraunhofer zone diffraction patterns can be obtained from fabricated microtags without any intervening optics and compare favorably with predicted diffraction patterns.
ISSN:0146-9592
DOI:10.1364/OL.21.001951