Terahertz and Infrared Plasmon Polaritons in PtTe Type-II Dirac Topological Semimetal.

Surface plasmon polaritons (SPPs) are electromagnetic excitations existing at the interface between a metal and a dielectric. SPPs provide a promising path in nanophotonic devices for light manipulation at the micro and nanoscale with applications in optoelectronics, biomedicine, and energy harvesting. Recently, SPPs are extended to unconventional materials like graphene, transparent oxides, superconductors, and topological systems characterized by linearly dispersive electronic bands.

Extraordinary optical transmittance generation on SiN membranes.

Metamaterials are attracting increasing attention due to their ability to support novel and engineerable electromagnetic functionalities. In this paper, we investigate one of these functionalities, the extraordinary optical transmittance (EOT) effect based on silicon nitride (SiN) membranes patterned with a periodic lattice of micrometric holes. Here, the coupling between the incoming electromagnetic wave and a SiN optical phonon located around 900 cm triggers an increase of the transmitted infrared intensity in an otherwise opaque spectral region.