A polarization-sensitive diffractive optical device for document security

Ivo Aubrecht; Miroslav Miler

doi:10.1117/12.778998

25 April 2008 A polarization-sensitive diffractive optical device for document security

Ivo Aubrecht, Miroslav Miler

Proceedings Volume 6994, Photon Management III; 69940V (2008) https://doi.org/10.1117/12.778998
Event: SPIE Photonics Europe, 2008, Strasbourg, France

Abstract

Devices for document security consisting of a thin metallic film the boundaries of which are undulated with a relief of a rainbow hologram, with the lower boundary facing to a lossless medium and the upper one facing (i) to a lossless medium with the same refractive index or (ii) to a thin dielectric film with a higher refractive index, are proposed. When viewed through in collimated and monochromatic light, they exhibit unique angular variation of appearance - a marked succession of dark and bright areas if the incident beam is polarized in the plane of recording of the hologram (the s-polarization). The devices are modelled as single-film and double-film structures that are composed either of a 30 nm thick silver film, which is sandwiched between two photoresist layers, or of a 30 nm thick silver film, which is deposited on a photoresist layer, and a 60 nm thick overlay film of titanium dioxide. Sensitivity to the polarization and the unique angular variation for the s-polarization follow from theoretical calculations, assuming a sinusoidal modulation of the surface relief, and they are demonstrated experimentally by capturing intensity distributions of light transmitted through realized samples in the zero diffraction order.

Citation Download Citation

Ivo Aubrecht and Miroslav Miler "A polarization-sensitive diffractive optical device for document security", Proc. SPIE 6994, Photon Management III, 69940V (25 April 2008); https://doi.org/10.1117/12.778998

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