Open AccessPolarization dependence and independence of near-field enhancement through a subwavelength circle hole
Author(s) -
Zu-Bin Li,
Wei Zhou,
XiangTian Kong,
Jianguo Tian
Publication year - 2010
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.18.005854
Subject(s) - polarization (electrochemistry) , optics , surface plasmon , plasmon , surface plasmon resonance , local field , circular polarization , materials science , physics , condensed matter physics , nanotechnology , chemistry , nanoparticle , microstrip
By setting a metal rod or tooth-type structures in a single subwavelength hole, its near-field can be strongly enhanced. The near-field enhancement has strong polarization dependence when the structure in hole is twofold symmetric. Only the polarization along the longitudinal side of the metal rod or tooth-type structure can lead to strongest enhancement, which is attributed to the resonance of the localized surface plasmon. However, if the structure in hole is fourfold symmetric, the near-field enhancement is free from the polarization.