Open AccessPlasmon hybridization in split ring nanosandwich for refractive index sensing– Numerical Investigation
Author(s) -
Sara M. Kandil,
Islam A. Eshrah,
Inas S. El Babli,
Ashraf H. Badawi
Publication year - 2016
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.24.030201
Subject(s) - refractive index , optics , plasmon , materials science , surface plasmon , perpendicular , stack (abstract data type) , sensitivity (control systems) , physics , geometry , mathematics , electronic engineering , computer science , programming language , engineering
In this paper, a numerical investigation of a new nanosandwich structure suitable for use in refractive index sensing is presented. The split ring nanosandwich consists of a stack of two gold split rings separated by a SiO 2 disk spacer where the gaps in the upper and lower split rings are in perpendicular axes. The optical properties of the structure are described using the plasmon hybridization picture. This structure shows a high tunability of the optical response due to its strong hybridized modes. Its sensitivity is explored as a function of its dimensions showing strong field enhancement and high refractive index sensitivity reaching 3024 nm/RIU and FOM of 1.4.