Design of Polarization Beam Splitter in Two-DimensionalTriangular Photonic Crystals

Abstract

A design of a polarization beam splitter (PBS) in two-dimensionaltriangular photonic crystals is proposed and numerically demonstrated,for the first time to our knowledge. The principle of the model isbased on the polarization dependence of the photonic band gaps inphotonic crystals; the polarization extinction ratios fortransverse-magnetic and transverse-electric modes are 11.5 dB and46.7 dB at the centre of its operating frequency range, respectively. Whenthe central wavelength is tuned at 1550 nm, the possible operationwavelength range of this structure can be as large as 28.5 nm, whichalmost covers the whole C band in modern optical communication systems.Furthermore, due to its small size and only one kind of material beinginvolved, the PBS structure may have practical applications in theintegrated optics field.