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Optics Letters

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  • Editor: Anthony J. Campillo
  • Vol. 30, Iss. 23 — Dec. 1, 2005
  • pp: 3195–3197

Thermal image encryption obtained with a SiO2 space-variant subwavelength grating supporting surface phonon-polaritons

Nir Dahan, Avi Niv, Gabriel Biener, Vladimir Kleiner, and Erez Hasman  »View Author Affiliations


Optics Letters, Vol. 30, Issue 23, pp. 3195-3197 (2005)
http://dx.doi.org/10.1364/OL.30.003195


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Abstract

Space-variant partially polarized thermal emission is investigated. We show that by coupling surface phonon-polaritons to a propagating field, large anisotropy of the emissivity is obtained within a narrow spectral range. We experimentally demonstrate this effect by fabricating a space-variant subwavelength grating on a SiO2 substrate to encrypt an image in the polarization state of a thermal radiation field.

© 2005 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(110.6820) Imaging systems : Thermal imaging
(240.5420) Optics at surfaces : Polaritons
(260.5430) Physical optics : Polarization

ToC Category:
Physical Optics

Citation
Nir Dahan, Avi Niv, Gabriel Biener, Vladimir Kleiner, and Erez Hasman, "Thermal image encryption obtained with a SiO2 space-variant subwavelength grating supporting surface phonon-polaritons," Opt. Lett. 30, 3195-3197 (2005)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-30-23-3195


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References

  1. H. Raether, Surface Plasmons on Smooth and Rough Surfaces and on Gratings (Springer, 1988).
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