We present what we believe to be the first experimental demonstration of discrete solitons under the influence of first- and second-order lattice site interaction in zigzag femtosecond laser-written waveguide arrays. We show how the formation of these entities is affected by different ratios of the interaction strength. Increasing the second-order coupling between the lattices sites yields an almost linear increase of the input power required for soliton formation.
© 2009 Optical Society of America
Original Manuscript: April 22, 2009
Revised Manuscript: July 27, 2009
Manuscript Accepted: August 4, 2009
Published: September 14, 2009
Alexander Szameit, Robert Keil, Felix Dreisow, Matthias Heinrich, Thomas Pertsch, Stefan Nolte, and Andreas Tünnermann, "Observation of discrete solitons in lattices with second-order interaction," Opt. Lett. 34, 2838-2840 (2009)