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Proceedings Paper

Characterization of optically variable film using goniospectroscopy
Author(s): Shari Powell Fisher; Roger W. Phillips; Mike Nofi; Robert G. Slusser
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Paper Abstract

An optically variable film (OVF) is designed to exhibit a significant color shift with changing observation angle. This color shift was characterized by multi-angle reflectance measurements using a goniospectrophotometer system that also calculated the angle dependent performance of the optically variable film. The reflectance and color of the optically variable film were predicted by optical thin film modelling and compared to the measured values. The optical constants of the materials used in the OVF were then modified based on the goniospectrophotometer measurements to estimate the reflectance more accurately and thus improve the modeled color predictions. Automating this iterative procedure to assess the refractive indices of the OVF components using multi-angle reflectance measurements could create an additional tool for monitoring the fabrication process.

Paper Details

Date Published: 7 September 1994
PDF: 9 pages
Proc. SPIE 2262, Optical Thin Films IV: New Developments, (7 September 1994); doi: 10.1117/12.185782
Show Author Affiliations
Shari Powell Fisher, Flex Products, Inc. (United States)
Roger W. Phillips, Flex Products, Inc. (United States)
Mike Nofi, Flex Products, Inc. (United States)
Robert G. Slusser, Flex Products, Inc. (United States)

Published in SPIE Proceedings Vol. 2262:
Optical Thin Films IV: New Developments
James D. Rancourt, Editor(s)

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