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Fabrication of Hologram Coins using Electron Beam Lithography

Published online by Cambridge University Press:  15 February 2011

Patrick W. Leech ,
Brett A. Sexton ,
Russell J. Marnock  and
Fiona Smith
Patrick W. Leech
Affiliation:
CSIRO Manufacturing and Infrastructure Technology, Clayton, 3169, Victoria, Australia.
Brett A. Sexton
Affiliation:
CSIRO Manufacturing and Infrastructure Technology, Clayton, 3169, Victoria, Australia.
Russell J. Marnock
Affiliation:
CSIRO Manufacturing and Infrastructure Technology, Clayton, 3169, Victoria, Australia.
Fiona Smith
Affiliation:
CSIRO Manufacturing and Infrastructure Technology, Clayton, 3169, Victoria, Australia.
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Abstract

Diffractive grating structures formed by electron beam lithography have been replicated into the surface of silver commemorative coins. The detailed features of the gratings and the depth of relief were accurately transferred from the resist master plate to the surface of the fine silver coins using a Ni shim as a replication tool. This method has produced an optically variable device (OVD) in the surface of the coins which exhibited a strong intensity of first order diffraction over the area of the image (3 × 1.5 cm). A feature of the grating structures formed in the coins were fine-scale protrusions located along the length of the ridges. The presence of these protrusions has been attributed to an adhesive transfer and back-transfer of Ag during the cycle of impact loading of the Ni shim for sequential coins.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 777: Symposium A – Nanostructuring Materials with Energetic Beams , 2003 , T8.5
Copyright
Copyright © Materials Research Society 2003

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References

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