Dielectric-dielectric Composite Photonic Crystals for Negative Refraction of Unpolarized Electromagnetic Waves

The investigations on negative refraction of unpolarized microwaves in dielectric-dielectric composite photonic crystals are presented. Similar to metal-dielectric composite photonic crystals, common negative refraction regime for both polarization modes (transverse electric and transverse magnetic) are also found in these dielectric composites. This paper further investigates the beam steering ability of an unpolarized microwave in these composites by analyzing the angular dispersion characteristics of both polarization modes. One can utilize this beam steering ability in the fields of far-field imaging and microwave devices.