Computer generated holographic microtags

Patent · Thu Jan 01 00:00:00 EST 1998

OSTI ID:871422

Sweatt, William C ^[1]

---

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 National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
• 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

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