title: Thermal image encryption obtained with a SiO2 space-variant subwavelength grating supporting surface phonon-polaritons.
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.
authors.affiliation: Optical Engineering Laboratory, Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa.
authors.forename: Nir
authors.initials: N
authors.lastname: Dahan
authors.forename: Avi
authors.initials: A
authors.lastname: Niv
authors.forename: Gabriel
authors.initials: G
authors.lastname: Biener
authors.forename: Vladimir
authors.initials: V
authors.lastname: Kleiner
authors.forename: Erez
authors.initials: E
authors.lastname: Hasman