Canning John, Skivesen Nina, Kristensen Martin, Frandsen Lars H, Lavrinenko Andrei, Martelli Cicero, Tetu A
Opt Express. 2007 Nov 12;15(23):15603-14. doi: 10.1364/oe.15.015603.
Both quasi-TE and TM polarisation spectra for a silicon-on-insulator (SOI) waveguide are recorded over (1100-1700)nm using a broadband supercontinuum source. By studying both the input and output polarisation eigenstates we observe narrowband resonant cross coupling near the lowest quasi-TE mode cut-off. We also observe relatively broadband mixing between the two eigenstates to generate a complete photonic bandgap. By careful analysis of the output polarisation state we report on an inherent non-reciprocity between quasi TE and TM fundamental mode cross coupling. The nature of polarisation distinction in such bandgap structures is discussed in the context of polarisation scattering at an interface.
