Computer generated holographic microtags

Details Computer generated holographic microtags Computer generated holographic microtags

1996-01-11

1998-03-17

Dzierzynski, Paul M.

Optical: systems and elements

Holographic system or element

Authentication

359 25, 359571, 359572, 235457, 283 86, 380 3, G03H 100, G02B 518

Patent

active

057293651

ABSTRACT:
A microlithographic tag comprising an array of individual computer generated holographic patches having feature sizes between 250 and 75 nanometers. The tag is a composite hologram made up of the individual holographic patches and contains identifying information when read out with a laser of the proper wavelength and at the proper angles of probing and reading. The patches are fabricated in a steep angle Littrow readout geometry to maximize returns in the -1 diffracted order. The tags are useful as anti-counterfeiting markers because of the extreme difficulty in reproducing them.

REFERENCES:
patent: 3580657 (1971-05-01), Sheridon
patent: 5291006 (1994-03-01), Nishiguma et al.
patent: 5291317 (1994-03-01), Newswanger
patent: 5621515 (1997-04-01), Hashino et al.
patent: 5629070 (1997-05-01), Korth

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