title: Guiding light in optically induced ring lattices with a low-refractive-index core.
abstract: 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.
authors.affiliation: Department of Physics and Astronomy, San Francisco State University, California 94132, USA.
authors.forename: Xiaosheng
authors.initials: X
authors.lastname: Wang
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Chen
authors.forename: Jianke
authors.initials: J
authors.lastname: Yang