title: Efficient parametric amplification of narrow beams in photonic crystals.
abstract: We theoretically predict and numerically demonstrate that narrow beams (of the width of few wavelengths) can be efficiently parametrically amplified in nonlinear photonic crystal (with chi((2)) nonlinearity) tuned to sub-diffractive (self-collimating) regimes. We derive relations and give analytic estimations for the efficiency of amplification.
authors.affiliation: Institució Catalana de Reserca i Estudis Avançats and Department de Fisica i Enginyeria Nuclear,Universitat Politècnica de Catalunya, Colom 11, E-08222 Terrassa, Barcelona, Spain. Kestutis.Staliunas@ff.vu.lt
authors.forename: Kestutis
authors.initials: K
authors.lastname: Staliunas
authors.forename: Yurii
authors.initials: Y
authors.lastname: Loiko
authors.forename: Ramon
authors.initials: R
authors.lastname: Herrero
authors.forename: Crina
authors.initials: C
authors.lastname: Cojocaru
authors.forename: Josep
authors.initials: J
authors.lastname: Trull