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

Nir Dahan, Avi Niv, Gabriel Biener, Vladimir Kleiner, Erez Hasman

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

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.

Original languageEnglish
Pages (from-to)3195-3197
Number of pages3
JournalOptics Letters
Volume30
Issue number23
DOIs
StatePublished - 1 Dec 2005
Externally publishedYes

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