10 nm SiO2 TM Slot Mode in Laterally Mismatched Asymmetric Fin-Waveguides

In this paper we demonstrate that by breaking the left/right symmetry in a bi-planar double-silicon on insulator (SOI) photonic crystal (PhC) fin-waveguide, can couple conventionally used transverse-electric (TE) polarized mode to transverse-magnetic (TM) polarization slot-mode. Finite difference time domain (FDTD) simulations indicate TE couples robust TM inside Brillouin zone. Broadband transmission data shows propagation identified with horizontal-slot within bandgap for fully mismatched fabricated devices. This simultaneously demonstrates conversion, and narrowest Si photonics SiO 2 slot-mode reported literature (10 nm wide slot), which both have many potential telecommunication applications.