Evanescent coupling in arrays of type II femtosecond laser-written waveguides in bulk x-cut lithium niobate

Heinrich, Matthias; Szameit, Alexander; Dreisow, Felix; Döring, Sven; Thomas, Jens; Nolte, Stefan; Tünnermann, Andreas; Ancona, Antonio
September 2008
Applied Physics Letters;9/8/2008, Vol. 93 Issue 10, p101111
Academic Journal
We report on the first fabrication of evanescently coupled planar arrays of type II waveguides in x-cut lithium niobate (LiNbO3) by femtosecond laser inscription. A particular choice of writing parameters allows the evanescent field of the individual waveguide modes to extend significantly beyond the damage lines into the neighboring guides, thus realizing a coupling constant of 2.2 cm-1 at a wavelength of 633 nm.


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