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http://dx.doi.org/10.3807/COPP.2018.2.1.047

Negative-refraction Effect for Both TE and TM Polarizations in Two-dimensional Annular Photonic Crystals  

Wu, Hong (School of Science, Nanjing University of Posts and Telecommunications)
Li, Feng (IEK-5 Photovoltaik, Forschungszentrum Julich)
Publication Information
Current Optics and Photonics / v.2, no.1, 2018 , pp. 47-52 More about this Journal
Abstract
We systematically investigated the negative-refraction effect for both TE and TM polarizations in annular photonic crystals. Since two polarization waves are excited in different bands, they result in different refractive angles, and so polarization beam splitters can be made of annular photonic crystals. It was found that, in comparison to normal square-lattice air-hole photonic crystals, annular photonic crystals have a much wider common frequency band between TE-1 and TM-2, which is quite beneficial to finding the overlap between the negative-refraction regions belonging to TE-1 and TM-2 respectively. Further analyses of equifrequency surfaces and the electric-field distribution of annular photonic crystals with different parameters have not only demonstrated how the filling factor of annular cells affects the formation of the common negative-refraction region between TE-1 and TM-2, but also revealed some ways to improve the performance of a polarization beam splitter based on the negative-refraction effect in an annular photonic crystal.
Keywords
Annular photonic crystals; Negative refraction; Polarization beam splitter;
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