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Fabrication of Hologram Coins using Electron Beam Lithography

  • Patrick W. Leech (a1), Brett A. Sexton (a1), Russell J. Marnock (a1) and Fiona Smith (a1)

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.

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References

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1. Valentine, B., Leech, P.W., Sexton, B.A., Marnock, R.J. and Smith, F., Proc. Mint Director's Conference, Osaka, (April 2002).
2. Lee, R.A., Microelectronic Engineering 53, 513516, (2000).
3. Lee, R.A., “The Optically Variable Device (OVD) as an anti-counterfeiting Feature”, Interpol 75th Anniversary Publication, Kensington Publications, 98101, (1998).
4. Leech, P.W., Sexton, B.A. and Marnock, R.J., Microelectronic Engineering 60, 339346, (2002).
5. Renesse, R.L. Van, “Irridescent Optically Variable Devices: A Summary” in Optical Document Security, 2nd Ed., Ed. Renesse, R.L. Van, Artech House, Boston, 349.
6. Antler, M., Thin Solid Films, 84, 245, (1981).
7. Buckley, D.H., Thin Solid Films, 53, 271, (1978).

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