We demonstrate self-trapping of light by simultaneously compensating normal and anomalous (saddle-shaped) diffractions with self-focusing and self-defocusing hybrid nonlinearity in optically induced ionic-type photonic lattices. Innovative two-dimensional gap solitons, named “saddle solitons,” are established, whose phase and spectrum characteristics are different from all previously observed spatial solitons.
© 2009 Optical Society of America
Original Manuscript: July 30, 2009
Manuscript Accepted: September 6, 2009
Published: October 19, 2009
Yi Hu, Cibo Lou, Peng Zhang, Jingjun Xu, Jianke Yang, and Zhigang Chen, "Saddle solitons: a balance between bi-diffraction and hybrid nonlinearity," Opt. Lett. 34, 3259-3261 (2009)