Power splitters based on the light-intensity-dependent superprism effect.
By utilizing the nonlinear Kerr effect of the background medium, power splitters based on the light-intensity-dependent superprism effect are realized in a two-stage system, where two photonic lattices are rotated to each other by 16 degrees . The nonlinear finite-difference time-domain method is applied to conducting numerical experiments. The first lattice acts as the deflecting stage, in which beams with different power densities are separated from each other spatially. The second lattice has a function of "angular amplifier" that enlarges the separation angle between two power density ranges (lower than 100 W/microm2 and higher than 300 W/microm2) to 90 degrees-like. In the first photonic band, due to the local change of refractive indices induced by the pumping power, new interfaces are formed between the pumped and nonpumped areas. The k-vector will be rotated by these interfaces until the phase velocity and group velocity have the same direction. The shape of the interface between these two stages is discussed.
Chen
Xiao-Jun
XJ
Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China.
Xu
Yi
Y
Lan
Sheng
S
Guo
Qi
Q
Yang
Xiangbo
X
Wu
Li-Jun
LJ