title: Measurements of the negative refractive index of sub-diffraction waves propagating in an indefinite permittivity medium.
abstract: An indefinite permittivity medium (IPM) has been fabricated and optically characterized in mid-infrared spectral range (10.7 µm-11.3 µm). Phase and amplitude transmission measurements reveal two remarkable properties of IPMs: (i) transmission of sub-diffraction waves (as short as λ/4) can exceed those of diffraction-limited ones, and (ii) sub-diffraction waves can propagate with negative refractive index. We describe a novel double-detector optical technique relying on the interference between sub-diffraction and diffraction-limited waves for accurate measurement of the transmission amplitude and phase of the former.
authors.affiliation: University of Texas at Austin, Department of Physics, Austin, Texas 78712, USA.
authors.forename: Dmitriy
authors.initials: D
authors.lastname: Korobkin
authors.forename: Burton
authors.initials: B
authors.lastname: Neuner
authors.forename: Chris
authors.initials: C
authors.lastname: Fietz
authors.forename: Nikoletta
authors.initials: N
authors.lastname: Jegenyes
authors.forename: Gabriel
authors.initials: G
authors.lastname: Ferro
authors.forename: Gennady
authors.initials: G
authors.lastname: Shvets