Abstract
We propose a two-dimensional (2D) annular photonic crystal (APC) with dual
equi-frequency contours (EFCs) in one band. The refractive behaviors of a Gaussian
beam incident from air to the APC are analyzed by the EFC analysis and
finite-difference time-domain (FDTD) method. The results show the positive-negative
birefraction phenomenon for the transverse magnetic (TM) polarization in the same
band occurs at the interface between air and the APC, and the surface termination of
the APC has a large effect on the strength of the negatively refracted beam.
© 2011 Chinese Optics Letters
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