Enhanced Confinement Due to Ultra-Flat Bands in Photonic Crystal Waveguides

摘要

We present examples of two-dimensional photonic crystal band structures which defy the conventional wisdom that aphotonic crystal provides optimal confinement for frequencies at the middle of the photonic band gap. This is due to thepresence of an ultra-flat photonic band that leads to enhanced confinement in an adjacent band gap at frequencies near theband gap edge and far from midgap.