title: Near-field and far-field analysis of an azimuthally polarized slow Bloch mode microlaser.
abstract: We report on the near- and far-field investigation of the slow Bloch modes associated with the Γ point of the Brillouin zone, for a honeycomb lattice photonic crystal, using near-field scanning optical microscopy (NSOM) and infra-red CCD camera. The array of doughnut-shaped monopolar mode (mode M) inside each unit cell, predicted previously by numerical simulation, is experimentally observed in the near-field by means of a metal-coated NSOM tip. In far-field, we detect the azimuthal polarization of the doughnut laser beam due to destructive and constructive interference of the mode radiating from the surface (mode TEM(01*)). A divergence of 2° for the laser beam and a mode size of (12.8 ± 1) µm for the slow Bloch mode at the surface of the crystal are also estimated.
authors.affiliation: Université de Lyon, Institut des nanotechnologies de Lyon INL-UMR 5270, CNRS, Ecole Centrale de Lyon, Lyon, France.
authors.forename: Thanh-Phong
authors.initials: TP
authors.lastname: Vo
authors.forename: Adel
authors.initials: A
authors.lastname: Rahmani
authors.forename: Ali
authors.initials: A
authors.lastname: Belarouci
authors.forename: Christian
authors.initials: C
authors.lastname: Seassal
authors.forename: Dusan
authors.initials: D
authors.lastname: Nedeljkovic
authors.forename: Ségolène
authors.initials: S
authors.lastname: Callard
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D008027:Light; D008904:Miniaturization; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation