Computer generated holographic microtags

Patent · 31 December 1997

OSTI ID:871422

Sweatt, William C ^[1]

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1. Albuquerque, NM

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.

• Research Organization: SANDIA CORP
• DOE Contract Number: AC04-94AL85000
• Assignee: Sandia Corporation (Albuquerque, NM)
• Patent Number(s): US 5729365
• OSTI ID: 871422
• Country of Publication: United States
• Language: English

Related Subjects

-1
/359/235/283/
250
75
angle
angles
anti-counterfeiting
array
composite
comprising
computer
computer generated
contains
difficulty
diffracted
extreme
fabricated
feature
feature sizes
generated
generated holographic
geometry
hologram
holographic
identifying
individual
information
laser
littrow
markers
maximize
microlithographic
microtags
nanometers
patches
probing
proper
reading
readout
reproducing
returns
sizes
steep
tag
tags
useful
wavelength