Plasmonic effects in composite metal nanostructures for sensing applications

We have investigated numerically the plasmonic effect on a two-dimensional periodic array of metallic nanostructures. The unit cell of the array has an Ag nanosphere and nanorod pair formed in a single structure. Three-dimensional finite element method is used for the study on the sensing performanc...

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Bibliographic Details
Published in:Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2018-07, Vol.20 (7), p.1-13, Article 190
Main Authors: Chau, Yuan-Fong Chou, Chao, Chung-Ting Chou, Chiang, Hai-Pang, Lim, Chee Ming, Voo, Nyuk Yoong, Mahadi, Abdul Hanif
Format: Article
Language:English
Subjects:
Absorptance
Absorptivity
Cell surface
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composite materials
Detection
Finite element method
Inorganic Chemistry
Lasers
Materials Science
Metals
Nanorods
Nanospheres
Nanostructure
Nanotechnology
Optical Devices
Optics
Parameters
Photonics
Physical Chemistry
Reflectance
Refractivity
Research Paper
Silver
Unit cell
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Summary:We have investigated numerically the plasmonic effect on a two-dimensional periodic array of metallic nanostructures. The unit cell of the array has an Ag nanosphere and nanorod pair formed in a single structure. Three-dimensional finite element method is used for the study on the sensing performance within the optical spectra. The study takes into account the influences of the structural and material parameters, the rotational angle of the metal nanostructure, the number of metal nanostructure per unit cell, and the localized surface plasmon resonances. The proposed nanostructures function as a refractive index sensor with a sensitivity of 400 nm/RIU (RIU is the refractive index unit), showing the characteristics of low transmittance ( T  = 3.90%), high absorptance (A = 94.5%), and near-zero reflectance ( R  = 0.15%), could be achieved by a triangular arrangement of nanostructures within a unit cell. We also show how the tailoring of the structural parameters relates to the specific sensing schematics of the sensor. Graphical abstract x-y sectional plane of electric field intensity, electric force lines (pink lines), energy flows (green arrows) and surface charge density of type 2, corresponding to the surrounding testing medium of (a) n=1.00 and (b) n=1.33 around the PMNSs.
ISSN:1388-0764
1572-896X
DOI:10.1007/s11051-018-4293-4