title: Optical propagator in a graded-index medium with a hyperbolic secant refractive-index profile.
abstract: Light transmission through a gradient-index medium, whose refractive-index profile can be represented by a one-dimensional hyperbolic secant function, is analyzed by a wave-optics approach. An asymptotic expression of the corresponding optical propagator (the Green's function) in this medium is evaluated in a such a way that nonparaxial propagation can be studied. Thus optical transformations such as focusing and collimation are obtained, and the pupil effect (diffractive effect) is shown.
authors.forename: J
authors.initials: J
authors.lastname: Liñares
authors.forename: C
authors.initials: C
authors.lastname: Gómez-Reino