One-dimensional photonic crystal waveguide based on the SOI platform for transverse magnetic polarization-maintaining devices

In this letter, a TM-polarization C-band pass of one-dimensional photonic crystal strip waveguide (1D-PCSW) is presented. The waveguide structure is based on a silicon-on-insulator platform which is easy to realize using standard CMOS technology. A numerical study is conducted via the 3D-finite element method (FEM). The transmittance and polarization extinction ratio (PER) is enhanced by optimizing the geometric parameters of the device. As a result, a TM polarized light can travel in the waveguide with similar to 2 dB loss for all the C-band telecommunication wavelength window whereas the TE polarized light suffers a high transmission loss of >30 dB. As a result, a PER of similar to 28.5 dB can be obtained for the whole C-band wavelengths range. The total length of the proposed device is around 8.4 mu m long including a 1 mu m silicon strip waveguide segment on both ends. Based on our study presented in this paper, several photonic devices can be realized where strict polarization filtering is required.