title: Tunable two-dimensional hexagonal phase array in domain-engineered Z-cut lithium niobate crystal.
abstract: An optical phase array with tunable phase step is demonstrated. The phase array consists of a two-dimensional hexagonal lattice of inverted ferroelectric domains fabricated on a Z-cut lithium niobate substrate. The electro-optically tunable phase step is obtained by the application of an external electric field along the z axis of the crystal via transparent electrodes. Theoretical analysis and experimental results are presented, showing that a tunable and flexible adaptive optical illuminator device can be realized by combining the electro-optic tunability with the Talbot effect. Generation of a multiplicity of light patterns is shown.
authors.affiliation: Istituto Nazionale di Ottica Applicata de CNR and LENS-European Laboratory for Nonlinear Spectroscopy, Pozzuoli (Na), Italy. melania.paturzo@inoa.it
authors.forename: M
authors.initials: M
authors.lastname: Paturzo
authors.forename: P
authors.initials: P
authors.lastname: De Natale
authors.forename: S
authors.initials: S
authors.lastname: De Nicola
authors.forename: P
authors.initials: P
authors.lastname: Ferraro
authors.forename: S
authors.initials: S
authors.lastname: Mailis
authors.forename: R W
authors.initials: RW
authors.lastname: Eason
authors.forename: G
authors.initials: G
authors.lastname: Coppola
authors.forename: M
authors.initials: M
authors.lastname: Iodice
authors.forename: M
authors.initials: M
authors.lastname: Gioffré