Abstract
We have designed two photonic crystal waveguide (PCW) structures with output
focused beams in order to achieve more coupling between photonic devices and
decrease the mismatch losses in photonic integrated circuits. PCW with coupled
resonator optical waveguide (CROW) termination has been optimized by both one
dimensional (1D) and seven dimensional (7D) particle swarm optimization (PSO)
algorithms by evaluating the fitness function by the finite difference time domain
(FDTD) method. The 1D and 7D-optimizations caused the factors of 2.79 and 3.875
improvements in intensity of the main lobe compared to the non-optimized structure,
whereas the FWHM in 7D-optimized structure was increased, unlike the 1D case. It has
also been shown that the increment of focusing causes decrement of the
bandwidth.
© 2011 Optical Society of Korea
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