Nanoscale plasmonic TM-pass polarizer integrated on silicon photonics.

Transverse electric (TE)-pass polarizers integrated in silicon-on-insulator photonic circuits, based on hybrid plasmonic absorption, have been widely discussed as a key component for applications in information and communication technologies. Nevertheless, the complementary transverse magnetic (TM)-pass polarizer has not been developed due to the TM nature of plasmonic modes. Here, we experimentally demonstrate a nano-scale TM-pass polarizer based on TE-polarized plasmonic absorption using a periodic metal nanoparticle chain integrated on a silicon waveguide. Currently, the measured extinction ratio is 23 dB μm-1 and the insertion loss is 2.4 dB μm-1 at the central wavelength of 1.59 μm, in a device with a footprint of 630 nm (0.4λ). This polarization-selective absorption is analyzed using dispersion curves and transmission near-field scanning optical microscopy. The nanophotonic device completes an integrated polarizer based on plasmonic absorption and provides the necessary footprint for high density integration in photonic integrated circuits.