title: Diffractive m-bonacci lenses.
abstract: Fibonacci zone plates are proving to be promising candidates in image forming devices. In this letter we show that the set of Fibonacci zone plates are a particular member of a new family of diffractive lenses which can be designed on the basis of a given m-bonacci sequence. These lenses produce twin axial foci whose separation depends on the m-golden mean. Therefore, with this generalization, bifocal systems can be freely designed under the requirement at particular focal planes. Experimental results support our proposal.
authors.forename: Federico
authors.initials: F
authors.lastname: Machado
authors.forename: Vicente
authors.initials: V
authors.lastname: Ferrando
authors.forename: Walter D
authors.initials: WD
authors.lastname: Furlan
authors.forename: Juan A
authors.initials: JA
authors.lastname: Monsoriu