title: Observation of lower to higher bandgap transition of one-dimensional defect modes.
abstract: We demonstrate one-dimensional optically-induced photonic lattices with a negative defect and observe linear bandgap guidance in such a defect. We show that a defect mode moves from the first bandgap to a higher bandgap as the lattice potential is increased. Our experimental results are in good agreement with the theoretical analysis of these effects.
authors.affiliation: Department of Physics and Astronomy, San Francisco State University, CA 94132, USA.
authors.forename: Xiaosheng
authors.initials: X
authors.lastname: Wang
authors.forename: Jack
authors.initials: J
authors.lastname: Young
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Chen
authors.forename: Doug
authors.initials: D
authors.lastname: Weinstein
authors.forename: Jianke
authors.initials: J
authors.lastname: Yang
mesh_terms: D004867:Equipment Design; D008422:Materials Testing / Q000379:methods*; D036103:Nanotechnology / Q000295:instrumentation*; D055095:Optics and Photonics / Q000295:instrumentation*