Spoof localized surface plasmon resonances (LSPRs) in the THz range are promising for bio-sensing and spectroscopy. Using long spiral grooves allows improving the surface mode confinement of LSPRs in the long-wavelength region. Our numerical simulations of sub-wavelength spiral gold disks in the range of 0.04-6 THz have shown that in case of Drude conductivity and normal incidence of EM radiation only the first- and second-order dipole localized surface plasmon resonances (LSPRs) are excited. High order resonances arise at inclined incidence. The spectra and 2D distributions of the EM field at the resonant frequencies depend on the number of spiral arms and symmetry of the spiral structure.
|Number of pages||4|
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 23 Apr 2020|
|Event||4th International Conference on Metamaterials and Nanophotonics, METANANO 2019 - St. Petersburg, Russian Federation|
Duration: 15 Jul 2019 → 19 Jul 2019