Polarization-dependent transmission properties of IOSOI W1 photonic crystal waveguides

We present polarization-dependent optical transmission properties of a W1 photonic crystal (PhC) waveguide realized in the completely symmetric insulator-on-silicon-on-insulator (IOSOI) material system. For an IOSOI W1 PhC waveguide we found a polarization crosstalk of −15 dB between TE- and TM-polarization. Furthermore, we found a transmitted signal in a spectral range where the calculated bandstructure predicts a bandgap and could verify this by FDTD simulations. This facts have to be taken carefully into account when designing PhC circuits.

Research highlights
► Polarization-dependent optical transmission properties of a W1 photonic crystal waveguide realized in an insulator-on-silicon-on-insulator (IOSOI) material system.
► Polarization crosstalk of −15 dB between TE- and TM-polarization.
► Transmitted signal in a spectral range where bandstructure calculations predict a bandgap; verification of this result by FDTD simulations.