title: 4π Focusing of TM(01) beams under nonparaxial conditions.
authors.affiliation: Centre d’Optique, Photonique et laser, Université Laval, Quebec City, Québec G1V 0A6, Canada. alexandre.april.1@ulaval.ca
authors.forename: Alexandre
authors.initials: A
authors.lastname: April
authors.forename: Michel
authors.initials: M
authors.lastname: Piché