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Journal ArticleDOI

Theoretical and Experimental Investigation of Enhanced Transmission Through Periodic Metal Nanoslits for Sensing in Water Environment

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TLDR
In this paper, an experimental and theoretical study of sensors based on enhanced transmission through periodic metal nanoslits is presented, which consists of the design of one-dimensional nano-lits array and its application in sensing for water quality control.
Abstract
Experimental and theoretical study of sensors based on enhanced transmission through periodic metal nanoslits is presented. Our approach consists of the design of one-dimensional nanoslits array and its application in sensing for water quality control. Rigorous coupled waves analysis was used for the design and fit to the experimental data. Two types of surface plasmon resonance excitations are shown to be possible, one at the upper grating–analyte interface and one at the lower grating–substrate interface. This latter resonance is shown to be affected by the multiple interference or cavity-type effects. Those structures were fabricated by deposition of the metal layer and electron beam lithography of the nanostructure. We found that Ag-based periodic array exhibits the highest sensitivity to refractive index variations. Sensitivity enhancement was measured by ethanol concentrations in water. Stability of the Ag-based sensor was improved by covering the grating with less than 15 nm polymethyl methacrylate capping layer without deterioration of the sensitivity.

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Citations
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Journal ArticleDOI

Sensitivity‐enhancement methods for surface plasmon sensors

TL;DR: In this paper, a review of sensitivity-enhancement techniques for surface plasmon resonance (SPR) sensors focusing both on the physical transduction mechanisms and the system performance is presented.
Journal ArticleDOI

Nanostructures for surface plasmons

TL;DR: In this article, a review of the recent progress in nanostructures for surface plasmons is presented, where the resonance modes include longitudinal and transversal resonances, dipolar and multipolar resonances and Fano resonances.
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Coupling configurations between extended surface electromagnetic waves and localized surface plasmons for ultrahigh field enhancement

TL;DR: In this article, the authors reviewed the different configurations revealing enhanced EM fields, particularly those giving ultrahigh enhancement, such as when a localized SEW is excited not from free space but via an extended SEW.
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Plasmonic sensing using metallic nano-sculptured thin films.

TL;DR: The use of metal nSTFs in SPR biosensors with Kretschmann-Raether configuration enhances both the angular and the spectral sensitivities due to the porosity and adds more degrees of freedom in designing evanescent waves based techniques.
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Liquid crystal active nanophotonics and plasmonics: from science to devices

TL;DR: A new field of research has emerged that combines liquid crystals (LCs) with nanostructures, such as subwavelength gratings, nanoporous materials, and nanoparticles.
References
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Book

CRC Handbook of Chemistry and Physics

TL;DR: CRC handbook of chemistry and physics, CRC Handbook of Chemistry and Physics, CRC handbook as discussed by the authors, CRC Handbook for Chemistry and Physiology, CRC Handbook for Physics,
Journal ArticleDOI

Surface plasmon subwavelength optics

TL;DR: By altering the structure of a metal's surface, the properties of surface plasmons—in particular their interaction with light—can be tailored, which could lead to miniaturized photonic circuits with length scales that are much smaller than those currently achieved.
Journal ArticleDOI

Extraordinary optical transmission through sub-wavelength hole arrays

TL;DR: In this article, the optical properties of submicrometre cylindrical cavities in metallic films were explored and it was shown that arrays of such holes display highly unusual zero-order transmission spectra at wavelengths larger than the array period, beyond which no diffraction occurs.
Journal ArticleDOI

Surface plasmon resonance sensors: review

TL;DR: Main application areas are outlined and examples of applications of SPR sensor technology are presented and future prospects of SPR technology are discussed.
Journal ArticleDOI

Theory of Diffraction by Small Holes

TL;DR: In this paper, the diffraction of electromagnetic radiation by a hole small compared with the wave-length is treated theoretically, and a complete solution is found satisfying Maxwell's equations and the boundary conditions everywhere.
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