All-angle self-collimation in two-dimensional square array photonic crystals based on index contrast tailoring

作者：Noori Mina^*; Soroosh Mohammad; Baghban Hamed

来源：Optical Engineering, 2015, 54(3): 037111.

DOI：10.1117/1.OE.54.3.037111

• self-collimation
• photonic crystal
• equal frequency contour
• photonic band gap

A comprehensive study has been performed to achieve all-angle self-collimation in basic two-dimensional square array photonic crystals with cylindrical scatterers. Based on plane wave expansion and finite difference time domain analysis for both rod- and hole-type structures, we report on all-angle self-collimation (SC) in the first band of the structure, which results in loss suppression due to out-of-plane scatterings. A lower threshold for index contrast has been obtained to achieve all-angle SC, which offers more design flexibility regarding structural parameters. Furthermore, it has been shown that a minimum and maximum coupling efficiency enhancement of similar to 40% and 80% can be achieved for the proposed structure, respectively, by introducing a row of scatterers with proper radius at the input and the output air/photonic crystal interfaces.

• 出版日期2015-3