This paper investigates the near field focusing behavior corresponding to the hyperbolic dispersion regime at the second band of the square lattice photonic crystal (PC). Numerical studies reveal the influence of the corner part negative refraction in the observed focusing effect, though the major part of the refraction is divergent at this hyperbolic regime. It is further observed that the investigated dispersion shows the surface mode behavior when the effective index of the PC slab is higher than the air medium. This aspect may be implemented for the excitation and transfer of near fields for an evanescent wave microscopy.
"Near Field Focusing Effect and Hyperbolic Dispersion in Dielectric Photonic Crystals," Progress In Electromagnetics Research M,
Vol. 20, 179-190, 2011. doi:10.2528/PIERM11070702
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