Anomalous All-Angle Negative Refraction in High Dielectric Photonic Crystals

In this article, a 2D rod-type square lattice photonic crystal is investigated to achieve all-angle negativerefraction for TE polarization in a broad bandwidth of Δω/ωc=8.8%. It was demonstrated that with high dielectricmaterial use, the equal frequency contours demonstrate entirely different behavior. The plane wave expansion method’sresults show that the first band resembles a homogeneous material and all-angle negative refraction is obtained in theГM direction for the 2nd band. Finite difference time domain analysis are used to further prove the achievement and theobtained results are in a good agreement.

Keywords:

Photonic crystals , Negative refraction , All-angle , PWE , EFC , FDTD