Open AccessEnhanced Focusing Properties Using Surface Plasmon Multilayer Gratings
Author(s) -
Hui Li,
Lianshan Yan,
Zhen Guo,
Wei Pan,
Kunhua Wen,
Hengyi Li,
Xiangang Luo
Publication year - 2012
Publication title -
ieee photonics journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 73
eISSN - 1943-0655
pISSN - 1943-0647
DOI - 10.1109/jphot.2011.2178591
Subject(s) - engineered materials, dielectrics and plasmas , photonics and electrooptics
A subwavelength slit with metal-dielectric-metal (MDM) composite surface gratings is proposed and numerically investigated using finite-difference time-domain (FDTD) method. Compared with conventional monometal-grating based structures, focusing properties of the proposed MDM structure can be enhanced based on multiple scattering and coupling of surface plasmon polaritons (SPPs) along the metal/dielectric multilayer films, especially the focal length can be varied from ~ 2.6 to 5.82 μm by adjusting the dielectric thickness.