Open AccessInfrared localized surface plasmon dark multipole modes generated on subwavelength corrugated metal disks
Author(s) -
V. V. Bulgakova,
V. V. Gerasimov,
Ruslan R. Hafizov,
A. G. Lemzyakov
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 - 10.1088/1742-6596/1461/1/012047
Subject(s) - multipole expansion , quadrupole , dipole , terahertz radiation , optics , excited state , surface plasmon , localized surface plasmon , resonator , resonance (particle physics) , physics , plasmon , atomic physics , quantum mechanics
Terahertz (THz) radiation is very promising for chemical and biological sensing. One of the ways to realize a THz sensor is exciting multipole localized surface plasmon resonances (LSPRs) on subwavelength corrugated metal disks. In this paper, numerical modeling and analysis of LSPRs on a periodic array of such structures were made. At normal incidence of the incoming wave, only dipole resonances can be excited. An additional C-shaped resonator placed in the vicinity of the disk produces dark multipole modes (quadrupole, hexapole, octupole, and decapole ones) due to hybridization of these modes with the brigth dipole mode of the C resonator. Besides, multipole modes can be excited at oblique illumination of the structure. With increase in the incident angle, the multipole resonances become stronger. The high Q-factor resonance modes observed for PEC disks are wider or disappeared in case of Drude gold permittivity.