Tunable two-dimensional hexagonal phase array in domain-engineered Z-cut lithium niobate crystal.
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.
Paturzo
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M
Istituto Nazionale di Ottica Applicata de CNR and LENS-European Laboratory for Nonlinear Spectroscopy, Pozzuoli (Na), Italy. melania.paturzo@inoa.it
De Natale
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P
De Nicola
S
S
Ferraro
P
P
Mailis
S
S
Eason
R W
RW
Coppola
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G
Iodice
M
M
Gioffré
M
M