
Extraordinary optical transmission in nano-bridged plasmonic arrays mimicking a stable weakly-connected percolation threshold
Author(s) -
Eser Metin Akinoglu,
Lingpeng Luo,
Tyler Dodge,
Lihui Guo,
Goekalp Engin Akinoglu,
Xin Wang,
Linling Shui,
Guofu Zhou,
Michael Naughton,
Krzysztof Kempa,
Michael Giersig
Publication year - 2020
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.403034
Subject(s) - percolation threshold , plasmon , materials science , percolation (cognitive psychology) , surface plasmon , optics , optoelectronics , nano , nanotechnology , physics , electrical resistivity and conductivity , quantum mechanics , neuroscience , biology , composite material
Ultrasensitive sensors of various physical properties can be based on percolation systems, e.g., insulating media filled with nearly touching conducting particles. Such a system at its percolation threshold featuring the critical particle concentration, changes drastically its response (electrical conduction, light transmission, etc.) when subjected to an external stimulus. Due to the critical nature of this threshold, a given state at the threshold is typically very unstable. However, stability can be restored without significantly sacrificing the structure sensitivity by forming weak connections between the conducting particles. In this work, we employed nano-bridged nanosphere lithography to produce such a weakly connected percolation system. It consists of two coupled quasi-Babinet complementary arrays, one with weakly connected, and the other with disconnected metallic islands. We demonstrate via experiment and simulation that the physics of this plasmonic system is non-trivial, and leads to the extraordinary optical transmission at narrowly defined peaks sensitive to system parameters, with surface plasmons mediating this process. Thus, our system is a potential candidate for percolation effect based sensor applications. Promising detection schemes could be based on these effects.