Ultraslow-light effects in symmetric and asymmetric waveguide structures with moon-like scatterers

Abstract

Ultraslow-light effects in two-dimensional hexagonal-lattice coupled waveguide with moon-like scatterers were theoretically studied using the plane-wave expansion method. For symmetric structures, simulations showed that slow light with high group index can be achieved by shifting the scatterers and adjusting the radius of moon-like scatterers. The maximum group index was over 8.0×10⁴. For asymmetric structures, simulations showed that slow light with flat band and high group index can be obtained by shifting the scatterers, adjusting the radius of moon-like scatterers, and rotating the scatterers. The maximum group index was over 5.7×10⁵ with a “saddle-like” relationship between the frequency and group index.

Keywords

moon-like scatterer / slow light / coupled waveguide / photonic crystal

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