Open AccessStudying localized surface plasmon resonances in the THz region for subwavelength spiral disks
Author(s) -
V. V. Gerasimov,
Sergei A. Kuznetsov,
A. G. Lemzyakov,
Ruslan R. Hafizov
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1461/1/012048
Subject(s) - localized surface plasmon , plasmon , surface plasmon , spiral (railway) , optics , surface plasmon polariton , dipole , physics , wavelength , materials science , mathematical analysis , mathematics , quantum mechanics
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.