title: Band-gap guidance in optically induced photonic lattices with a negative defect.
abstract: We report the first experimental demonstration of band-gap guidance of light in an optically induced two-dimensional photonic lattice with a single-site negative defect (akin to a low-index core in photonic-crystal fibers). We discuss the difference between spatial guidance at a regular and a defect site, and show that the guided beam through the defect displays fine structures such as vortex cells that arise from defect modes excited at higher band gaps. Defect modes at different wavelengths are also observed.
authors.affiliation: Department of Physics and Astronomy, San Francisco State University, San Francisco, California 94132, USA.
authors.forename: Igor
authors.initials: I
authors.lastname: Makasyuk
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Chen
authors.forename: Jianke
authors.initials: J
authors.lastname: Yang