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Proceedings Paper

Expanding a color presentation range with true-color dot matrix holograms
Author(s): Chih-Wen Tu; Yi An Han; Chih-Kung Lee; Jeremy W.J. Wu; April S. T. Peng; Eric H. Z. Liao; Julie T. Lee
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Paper Abstract

The major purpose of this article is to evaluate the various aspects of color composition and color reconstruction by using diffractive technology, i.e. representing color by combining light beams of various spectra generated from shining an incident light beam onto multiple diffractive grating pixels. Using the linearity feature of the CIE chromaticity diagram, it can be shown that the colo representation range encircled by the diffractive technology can cover almost the whole color-visible range that is perceivable by humans. With the advantages of the various characteristics of the CIE diagram, also to be discussed is the newfound freedom of diffractive color-composition technology offered to approach the anti- counterfeit tasks from a brand new perspective. In addition, also detailed is the term metamerism, i.e. the same color that can be composed by using different sets of color spectra, which can be used to facilitate several potential anti- counterfeit approaches. By using a newly developed dot matrix writer, which has a simple and efficient optical configuration to implement on-the-fly grating pitch change, various grating pixels which possess vastly different pitch are used to implement and evaluate the effectiveness of the diffractive color composition technology. Both theoretical analysis and experimental results are presented to examine the potential when a variable pitch dot matrix writer is used.

Paper Details

Date Published: 25 March 1999
PDF: 11 pages
Proc. SPIE 3637, Practical Holography XIII, (25 March 1999); doi: 10.1117/12.343764
Show Author Affiliations
Chih-Wen Tu, National Taiwan Univ. (Taiwan)
Yi An Han, National Taiwan Univ. (Taiwan)
Chih-Kung Lee, National Taiwan Univ. (Taiwan)
Jeremy W.J. Wu, National Taiwan Univ. (Taiwan)
April S. T. Peng, AHEAD Optoelectronics, Inc. (Taiwan)
Eric H. Z. Liao, AHEAD Optoelectronics, Inc. (Taiwan)
Julie T. Lee, AHEAD Optoelectronics, Inc. (Taiwan)

Published in SPIE Proceedings Vol. 3637:
Practical Holography XIII
Stephen A. Benton, Editor(s)

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