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Issue 21, 2016
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A semi-analytical decomposition analysis of surface plasmon generation and the optimal nanoledge plasmonic device

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Abstract

Surface plasmon resonance (SPR) of nanostructured thin metal films (so-called nanoplasmonics) has attracted intense attention due to its versatility for optical sensing and chip-based device integration. Understanding the underlying physics and developing applications of nanoplasmonic devices with desirable optical properties, e.g. intensity of light scattering and high refractive index (RI) sensitivity at the perforated metal film, is crucial for practical uses in physics, biomedical detection, and environmental monitoring. This work presents a semi-analytical model that enables decomposition and quantitative analysis of surface plasmon generation at a new complex nanoledge aperture structure under plane-wave illumination, thus providing insight on how to optimize plasmonic devices for optimal plasmonic generation efficiencies and RI sensitivity. A factor analysis of parameters (geometric, dielectric-RI, and incident wavelength) relevant to surface plasmon generation is quantitatively investigated to predict the surface plasmon polariton (SPP) generation efficiency. In concert with the analytical treatment, a finite-difference time-domain (FDTD) simulation is used to model the optical transmission spectra and RI sensitivity as a function of the nanoledge device's geometric parameters, and it shows good agreement with the analytical model. Further validation of the analytical approach is provided by fabricating subwavelength nanoledge devices and testing their optical transmission and RI sensitivity.

Graphical abstract: A semi-analytical decomposition analysis of surface plasmon generation and the optimal nanoledge plasmonic device

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Publication details

The article was received on 13 Jan 2016, accepted on 03 Feb 2016 and first published on 03 Feb 2016


Article type: Paper
DOI: 10.1039/C6RA01105E
Citation: RSC Adv., 2016,6, 17196-17203
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    A semi-analytical decomposition analysis of surface plasmon generation and the optimal nanoledge plasmonic device

    Z. Zeng, M. N. Mendis, D. H. Waldeck and J. Wei, RSC Adv., 2016, 6, 17196
    DOI: 10.1039/C6RA01105E

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