Iridescent materials and devices

Details Iridescent materials and devices Iridescent materials and devices

2001-09-03

2010-11-16

Shewareged, Betelhem (Department: 1785)

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

C428S198000, C428S220000, C428S913000, C428S913300

Reexamination Certificate

active

07833610

ABSTRACT:
An iridescent material comprises a diffraction grating incorporating a plurality of sheets (1) of a first substantially transparent material in parallel alignment and spaced away apart by quantities of a second substantially transparent material (2), the second material having a refractive index significantly lower than the refractive index of the first material, the plates being tilted at an angle θ to an axis X and the grating having a period d(X) in the direction of axis X, the angle θ and period d being such that a second diffraction grating is provided along an axis Z, perpendicular to axis X, the second diffraction grating having a period d(Z) and consisting of ten periods or less and whereby, the diffraction conditions of the grating can be simultaneously fulfilled by electromagentic radiation of a range of wavelength thereby causing iridescence. Materials according to the invention have applications in inter alia document security, anti-counterfeiting measures, artwork, gift wrapping paper and cards and clothing design.

REFERENCES:
patent: 467661 (1892-01-01), Jacobson
patent: 4501439 (1985-02-01), Antes
patent: 4958892 (1990-09-01), Jannson et al.
patent: 5116461 (1992-05-01), Lebby et al.
patent: 5234729 (1993-08-01), Wheatley et al.
patent: 5640255 (1997-06-01), Haines
patent: 0 442 206 (1991-08-01), None
Kogelnik H., “Coupled Wave Theory for Thick Hologram Gratings”, Bell System Technical Journal, pp. 2902-2947 (1969).

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