Journal
OPTICS EXPRESS
Volume 25, Issue 13, Pages 14644-14653Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.014644
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Funding
- Main Research Fund of Korea Research Institute of Machinery and Material [NK194B]
- Main Research Fund of Korea Research Institute of Standards and Science [KRISS-2017GP2017-0015]
- National Research Council of Science & Technology (NST), Republic of Korea [NK194B] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Here, we investigate a method to distinguish the counterfeits by patterning multiple reflective type grating directly on the surface of the original product and analyze the serial number from its rotation angles of diffracted fringes. The micro-sized gratings were fabricated on the surface of the material at high speeds by illuminating the interference fringe generated by passing a high-energy pulse laser through the Fresnel biprism. In addition, analysis of the grating's diffraction fringes was performed using a continuous wave laser. (C) 2017 Optical Society of America
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