title: Deep-subwavelength waveguiding via inhomogeneous second-harmonic generation.
abstract: We theoretically investigate second-harmonic generation in extremely narrow, subwavelength semiconductor and dielectric waveguides. We discuss a guiding mechanism characterized by the inhibition of diffraction and the suppression of cutoff limits in the context of a light trapping phenomenon that sets in under conditions of general phase and group velocity mismatch between the fundamental and the generated harmonic.
authors.affiliation: C M Bowden Research Center, AMSRD-AMR-WS-ST, RDECOM, Redstone Arsenal, Alabama 35898-5000, USA. vito.roppo@gmail.com
authors.forename: Vito
authors.initials: V
authors.lastname: Roppo
authors.forename: Maria Antonietta
authors.initials: MA
authors.lastname: Vincenti
authors.forename: Domenico
authors.initials: D
authors.lastname: de Ceglia
authors.forename: Michael
authors.initials: M
authors.lastname: Scalora