Integration of a photonic crystal polarization beam splitter and waveguide bend

In this work, we present the design of an integrated photonic-crystal polarization beam splitter (PC-PBS) and a low-loss photonic-crystal 60 waveguide bend. Firstly, the modal properties of the PC-PBS and the mechanism of the low-loss waveguide bend are investigated by the two-dimensional finite-difference time-domain (FDTD) method, and then the integration of the two devices is studied. It shows that, although the individual devices perform well separately, the performance of the integrated circuit is poor due to the multi-mode property of the PC-PBS. By introducing deformed airhole structures, a single-mode PC-PBS is proposed, which significantly enhance the performance of the circuit with the extinction ratios remaining above 20dB for both transverse-electric (TE) and transverse-magnetic (TM) polarizations. Both the specific result and the general idea of integration design are promising in the photonic crystal integrated circuits in the future. (C) 2009 Optical Society of America

National Nature Science Foundation of China 10634080 6083800360677046Chinese National Key Basic Research Special Fund 2006CB921705 National High Technology Research and Development Program of China 2006AA03Z403 Project supported by the National Nature Science Foundation of China (Grand No. 10634080, No. 60838003 and No. 60677046), the Chinese National Key Basic Research Special Fund (2006CB921705), and the National High Technology Research and Development Program of China (Grant No. 2006AA03Z403).