Waveguide security device

Details Waveguide security device Waveguide security device

1996-10-24

1999-03-09

Ngo, Hung N.

Optical waveguides

Optical fiber waveguide with cladding

Utilizing multiple core or cladding

385901, G02B 622

Patent

active

058811966

ABSTRACT:
A security device in the form of optically variable waveguides that produce color shifts at particular exit viewing angles. Wavelength filtering in the cladding layers using interference coatings and colorants produces waveguide modes of different colors. These optical devices can be incorporated within currency paper, gaming chips or credit cards to help determine their genuineness.

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