Analysis of leaky modes in deep-ridge waveguides using the compact 2D FDTD method

The compact 2D finite difference time domain method combined with the uniaxial anisotropic perfectly-matched-layer (UPML) absorption boundary condition and the Pade approximation transform has been employed in a novel method to analyse leaky modes in deep-ridge semiconductor waveguides. Compared with frequency-domain mode solvers based on complex root searching, this method is easy to implement and can calculate the mode loss and the propagation constant separately and reliably.