Li Zhang

Square‐Shaping of Sturdy Optical Vortex Droplets in Quasi‐Phase‐Matched Photonic Crystals

ABSTRACT We elaborate a scheme for controllable shaping of self‐trapped vortex states in a quasi‐phase‐matched three‐dimensional photonic crystal with the combination of self‐focusing quadratic and defocusing cubic material nonlinearities. The setting gives rise to sturdy droplet...