title: Collimations and negative refractions by slabs of 2D photonic crystals with periodically-aligned tube-type air holes.
abstract: The FDTD method was applied to investigate the two-dimensional PhC slabs with periodically-aligned tube-type air holes. By numerical simulations, we found negative refraction behaviors by tuning the incident angle into the narrow negative-refraction angle range, and the collimation effects were analyzed by means of wave vector diagrams.
authors.forename: Hao
authors.initials: H
authors.lastname: Zhang
authors.forename: Heyuan
authors.initials: H
authors.lastname: Zhu
authors.forename: Liejia
authors.initials: L
authors.lastname: Qian
authors.forename: Dianyuan
authors.initials: D
authors.lastname: Fan