We proposed a novel two-dimensional photonic crystal slab comprised of a number of silicon rods with different radii and locations in the square-lattice unit cell pattern. Such rod-type photonic crystal slabs were automatically optimized by the genetic algorithm and fabricated on the silicon-on-insulator wafer. In particular, the measured transmission spectra of the five-rods sample have shown a large accepted high-order bandgap between 1498 and 1648 nm (gap size is 9.54%). Based on the theories of multiple Bragg and Mie scattering effects, we have given a reasonable explanation to the large high-order bandgaps found in the present study.
© 2012 Optical Society of America
Original Manuscript: December 2, 2011
Revised Manuscript: March 2, 2012
Manuscript Accepted: March 5, 2012
Published: April 19, 2012
Liyong Jiang, Wei Jia, Gaige Zheng, and Xiangyin Li, "Design and fabrication of rod-type two-dimensional photonic crystal slabs with large high-order bandgaps in near-infrared wavelengths," Opt. Lett. 37, 1424-1426 (2012)