title: Near-field observation of beam steering in a photonic crystal superprism.
abstract: The optical near-field technique is applied to provide a direct experimental observation of the refracted beam propagation inside a photonic crystal structure displaying a superprism effect. The obtained results show a 35° light beam angle deviation for a wavelength variation from 1500 to 1600 nm. The experimentally determined beam divergence is in good agreement with modeling predictions and previously performed transmittance experiments. A marked self-collimation propagation over a broad 20 nm wide spectral range centered at λ=1550 nm is experimentally demonstrated. The developed technique opens promising perspectives for the invisibility cloaking structures investigation.
authors.affiliation: Groupe d'Optique de Champ Proche, Laboratoire Interdisciplinaire Carnot de Bourgogne, CNRS, 9 Avenue A. Savary, 21078 Dijon, France.
authors.forename: Jean
authors.initials: J
authors.lastname: Dellinger
authors.forename: Damien
authors.initials: D
authors.lastname: Bernier
authors.forename: Benoit
authors.initials: B
authors.lastname: Cluzel
authors.forename: Xavier
authors.initials: X
authors.lastname: Le Roux
authors.forename: Anatole
authors.initials: A
authors.lastname: Lupu
authors.forename: Frédérique
authors.initials: F
authors.lastname: de Fornel
authors.forename: Eric
authors.initials: E
authors.lastname: Cassan