Wide-angle beam refocusing using negative refraction in non-uniform photonic crystal waveguides.
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%.
Zengerle
Remigius
R
Hoang
Phuong
P