Delay-time investigation of electromagnetic waves through homogeneous medium and photonic crystal left-handed materials

Abstract

Results of the delay time for the electromagnetic wave to reach its final direction through both photonic crystal and homogeneous medium are presented. The delay- or transient-time results, based on different cases and different incoming wave angles, show that the diffracted beam is trapped at the interface. This delay time is longer for the negative refractive index photonic crystal and is almost twice the duration of the delay time for the positive one. For the homogeneous medium, we also find that at the interface between a right- and left-handed medium the delay time is even longer than in the photonic crystal case. A comparison between left-handed behavior in photonic crystals and homogeneous media is reported.