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...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-diflerence 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.展开更多
基金supported by the Science Foundation of China University of Mining and Technology (No.OK061065)the Fundamental Research Funds for the Central Universities (No. 2010LKWL10)
文摘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-diflerence 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.
