The effect of irregular hole shape on the spectrum and radiation losses of a photonic crystal waveguide is studied using Bloch-mode expansion. Deviations from a circular hole are characterized by a radius fluctuation amplitude and correlation angle. It is found that the parameter that determines the magnitude of the effect of disorder is the standard deviation of the hole areas. Hence, for a fixed amplitude of the radius fluctuation around the hole, those effects are strongly dependent on the correlation angle of the irregular shape, which suggests how to potentially improve the quality of photonic crystal structures.
© 2012 Optical Society of America
Original Manuscript: April 20, 2012
Revised Manuscript: June 13, 2012
Manuscript Accepted: June 16, 2012
Published: July 20, 2012
Momchil Minkov and Vincenzo Savona, "Effect of hole-shape irregularities on photonic crystal waveguides," Opt. Lett. 37, 3108-3110 (2012)