title: Control of directional evanescent coupling in fs laser written waveguides.
abstract: We investigate the evanescent coupling of femtosecond laser written waveguides with elliptical and circular shape. A directional tuning the coupling properties is realized in a cubic array by tilting the elliptical waveguides. This allows to specifically pronounce diagonal coupling. In contrast, directional insensitive coupling is demonstrated in a circular waveguide array based on circular waveguides.
authors.forename: Alexander
authors.initials: A
authors.lastname: Szameit
authors.forename: Felix
authors.initials: F
authors.lastname: Dreisow
authors.forename: Thomas
authors.initials: T
authors.lastname: Pertsch
authors.forename: Stefan
authors.initials: S
authors.lastname: Nolte
authors.forename: Andreas
authors.initials: A
authors.lastname: Tünnermann