Efficient transmission of 60/spl deg/ photonic-crystal bend by waveguide width tuning

摘要

Summary form only given. Photonic crystal (PhC) channel waveguides formed as single or multiple line defects have been investigated and, in the case of a lattice of air holes perforating a dielectric slab, even the single line defect PhC channel waveguides are multimoded. One method to tackle the problem in the case of waveguides with dielectric lateral confinement is to use low-Q cavity resonant effects as they have been shown to improve the performance of the junction(s). Our approach is targeted towards tuning the waveguide width at the region of the bend, because in this case, the modes of interest can be pushed closer to the mid-gap frequency. A two-dimensional finite-difference-time-domain (FDTD) tool is used in order to analyse the dependence of the transmission of the bend on the offset shift.