title: Intense Bessel-like beams arising from pyramid-shaped microtips.
abstract: We show both numerically and experimentally that intense, narrow, and low-divergence beams of light are produced at the apex of dielectric pyramid-shaped microtips. These beams exhibit a Bessel transverse profile but are narrower than the usual Bessel beam, allowing for a significant enhancement of the light intensity inside the beam. They are generated by axicon-like structures with submicrometric height imprinted in glass by combining optical lithography and chemical etching. The resulting beams are experimentally imaged using fluorescence microscopy, in remarkable agreement with numerical computations.
authors.affiliation: Laboratoire de Nanotechnologie et d’Instrumentation Optique, CNRS (UMR 6279 STMR), Université de Technologie de Troyes, 10010 Troyes, France.
authors.forename: Jérôme
authors.initials: J
authors.lastname: Martin
authors.forename: Julien
authors.initials: J
authors.lastname: Proust
authors.forename: Davy
authors.initials: D
authors.lastname: Gérard
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Bijeon
authors.forename: Jérôme
authors.initials: J
authors.lastname: Plain