A method is introduced to fabricate two-dimensional photonic crystal polarization splitter, which is based on the deposition of multiplayer films onto a grating. The plane-wave expansion method and the finite-difference time-domain method are used to calculate the band structure of this two-dimensional photonic crystal formed by a rectangular lattice of rectangular columns. After optimizing the thickness of each layer film, we find a large bandgap of TE. The theoretical relative bandwidth is 33.2%.
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