title: Wide-angle beam refocusing using negative refraction in non-uniform photonic crystal waveguides.
abstract: The phenomena of beam-steering and negative ray refraction in a graded 2D photonic crystal structure interface with plane tapered transitions to homogeneous waveguide regions is used for efficient far-field refocusing of highly divergent Gaussian beams. It is shown by numerical simulation that a 14microm long photonic crystal structure is able to refocus a small-spot Gaussian beam with an efficiency of about 90%.
authors.forename: Remigius
authors.initials: R
authors.lastname: Zengerle
authors.forename: Phuong
authors.initials: P
authors.lastname: Hoang