Diffractive subtractive color filter responsive to angle of...

Details Diffractive subtractive color filter responsive to angle of... Diffractive subtractive color filter responsive to angle of...

G - Physics

03

B

88/120

G03B 11/00 (2006.01) G02B 27/44 (2006.01) G06K 19/16 (2006.01)

Patent

CA 1188139

DIFFRACTIVE SUBTRACTIVE COLOR FILTER RESPONSIVE TO ANGLE OF INCIDENCE OF POLYCMROMATIC ILLUMINATING LIGHT Abstract A diffractive subtractive color filter (Fig. 1) includes a variable index-of-refraction optical medium (100) of certain minimum thickness (t) and periodicity (d) with respect to the wavelength of incident light. The filter meets certain specified constraints with respect to: (1) relative indices-of-refraction of both its internal structure and that of its surroundings (114, 116), (2) relative values of incident wavelength to periodicity and (3) the relative indices-of-refraction of the optical medium and its surroundings and operates to produce both angularly-dependent subtractive-color filter reflection spectra and subtractive-color filter transmission spectra in accordance with its physical parameters. Such filters are suitable for use as authenticating devices for sheet-material authenticated items.

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