We demonstrate a ring-shaped Bessel-like photonic lattice akin to a photonic bandgap fiber with a low-index core. While the ring lattice is optically induced in a bulk crystal with a self-defocusing nonlinearity, guidance of a probe beam propagating linearly through the core is clearly observed. The possible mechanism for such guidance is also discussed.
© 2006 Optical Society of America
Photorefractive Nonlinear Optics
Original Manuscript: January 10, 2006
Revised Manuscript: February 17, 2006
Manuscript Accepted: March 8, 2006
Xiaosheng Wang, Zhigang Chen, and Jianke Yang, "Guiding light in optically induced ring lattices with a low-refractive-index core," Opt. Lett. 31, 1887-1889 (2006)