Studying localized surface plasmon resonances in the THz region for subwavelength spiral disks

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 ran...

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Bibliographic Details
Published in:Journal of physics. Conference series 2020-03, Vol.1461 (1), p.12048
Main Authors: Gerasimov, V V, Kuznetsov, S A, Lemzyakov, A G, Hafizov, R R
Format: Article
Language:English
Subjects:
Dipoles
Disks
Grooves
Physics
Resonant frequencies
Spectrum analysis
Surface plasmon resonance
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Summary: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.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1461/1/012048