Open AccessPlasmonic focusing lens based on single-turn nano-pinholes array
Author(s) -
Jingran Zhang,
Zhongyi Guo,
Cai-Wang Ge,
Wei Wang,
Rongzhen Li,
Yongxuan Sun,
Fei Shen,
Shiliang Qu,
Jun Gao
Publication year - 2015
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.017883
Subject(s) - optics , plasmon , plasmonic lens , lens (geology) , planar , extraordinary optical transmission , ray , cylindrical lens , photonics , materials science , optoelectronics , surface plasmon , physics , surface plasmon polariton , computer graphics (images) , computer science
A miniature, simplified and planar plasmonic lens based on the circular array of nano-pinholes for on-axis beaming has been proposed and investigated systematically in the visible spectrum. Focusing properties of the designed plasmonic lens illuminated under circular polarized (CP) light for different radius of circular ring, filled with different dielectrics, with different numbers of pinholes have been investigated and analyzed in detail by finite element method (FEM). Our simulated results demonstrate such a miniature single-turn structure can also generate a totally centrosymmetric focusing spot under the CP illumination. Besides, by properly manipulating the filled dielectric and incident wavelengths, enhanced transmission, elongated depth of focus have also be realized, which can be used to modulate the transmitting fields effectively. Such a miniature and simplified plasmonic focusing lens can open up a vital path toward fiber-end planar photonic devices for biosensing and imaging.