Open AccessEnhanced optical transmission through a star-shaped bull’s eye at dual resonant-bands in UV and the visible spectral range
Author(s) -
Tavakol Nazari,
Reza Khazaeinezhad,
Woo Hyun Jung,
Bio Joo,
Byung Joo Kong,
Kyunghwan Oh
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.018589
Subject(s) - optics , finite difference time domain method , visible spectrum , multipole expansion , physics , multi band device , aperture (computer memory) , materials science , surface plasmon resonance , range (aeronautics) , plasmon , telecommunications , quantum mechanics , computer science , acoustics , antenna (radio) , composite material , nanoparticle
Dual resonant bands in UV and the visible range were simultaneously observed in the enhanced optical transmission (EOT) through star-shaped plasmonic structures. EOTs through four types of polygonal bull's eyes with a star aperture surrounded by the concentric star grooves were analyzed and compared for 3, 4, 5, and 6 corners, using finite difference time domain (FDTD) method. In contrast to plasmonic resonances in the visible range, the UV-band resonance intensity was found to scale with the number of corners, which is related with higher order multipole interactions. Spectral positions and relative intensities of the dual resonances were analyzed parametrically to find optimal conditions to maximize EOT in UV-visible dual bands.