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Differential Sensing with Replicated Plasmonic Gratings Interrogated in the Optical Switch Configuration

A new plasmonic configuration is proposed for application in a sensor and demonstrated for the detection of variations in the bulk refractive index of solutions. The configuration consists of monitoring two diffracted orders resulting from the interaction of a TM-polarized optical beam incident on a...

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Autores principales: Laffont, Emilie, Crespo-Monteiro, Nicolas, Valour, Arnaud, Berini, Pierre, Jourlin, Yves
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9919053/
https://www.ncbi.nlm.nih.gov/pubmed/36772228
http://dx.doi.org/10.3390/s23031188
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author Laffont, Emilie
Crespo-Monteiro, Nicolas
Valour, Arnaud
Berini, Pierre
Jourlin, Yves
author_facet Laffont, Emilie
Crespo-Monteiro, Nicolas
Valour, Arnaud
Berini, Pierre
Jourlin, Yves
author_sort Laffont, Emilie
collection PubMed
description A new plasmonic configuration is proposed for application in a sensor and demonstrated for the detection of variations in the bulk refractive index of solutions. The configuration consists of monitoring two diffracted orders resulting from the interaction of a TM-polarized optical beam incident on a grating coupler, operating based on an effect termed the “optical switch”. The two monitored diffracted orders enable differential measurements which cancel the drift and perturbations common to both, leading to an improved detection limit, as demonstrated experimentally. The measured switch pattern associated with the grating coupler is in good agreement with theory. Bulk sensing is demonstrated under intensity interrogation via the sequential injection of solutions comprised of glycerol in water into a fluidic cell. A limit of detection of about [Formula: see text] RIU was achieved. The optical switch configuration is easy to implement and is cost-effective, yielding a highly promising approach for the sensing and the real-time detection of biological species.
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spelling pubmed-99190532023-02-12 Differential Sensing with Replicated Plasmonic Gratings Interrogated in the Optical Switch Configuration Laffont, Emilie Crespo-Monteiro, Nicolas Valour, Arnaud Berini, Pierre Jourlin, Yves Sensors (Basel) Article A new plasmonic configuration is proposed for application in a sensor and demonstrated for the detection of variations in the bulk refractive index of solutions. The configuration consists of monitoring two diffracted orders resulting from the interaction of a TM-polarized optical beam incident on a grating coupler, operating based on an effect termed the “optical switch”. The two monitored diffracted orders enable differential measurements which cancel the drift and perturbations common to both, leading to an improved detection limit, as demonstrated experimentally. The measured switch pattern associated with the grating coupler is in good agreement with theory. Bulk sensing is demonstrated under intensity interrogation via the sequential injection of solutions comprised of glycerol in water into a fluidic cell. A limit of detection of about [Formula: see text] RIU was achieved. The optical switch configuration is easy to implement and is cost-effective, yielding a highly promising approach for the sensing and the real-time detection of biological species. MDPI 2023-01-20 /pmc/articles/PMC9919053/ /pubmed/36772228 http://dx.doi.org/10.3390/s23031188 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Laffont, Emilie
Crespo-Monteiro, Nicolas
Valour, Arnaud
Berini, Pierre
Jourlin, Yves
Differential Sensing with Replicated Plasmonic Gratings Interrogated in the Optical Switch Configuration
title Differential Sensing with Replicated Plasmonic Gratings Interrogated in the Optical Switch Configuration
title_full Differential Sensing with Replicated Plasmonic Gratings Interrogated in the Optical Switch Configuration
title_fullStr Differential Sensing with Replicated Plasmonic Gratings Interrogated in the Optical Switch Configuration
title_full_unstemmed Differential Sensing with Replicated Plasmonic Gratings Interrogated in the Optical Switch Configuration
title_short Differential Sensing with Replicated Plasmonic Gratings Interrogated in the Optical Switch Configuration
title_sort differential sensing with replicated plasmonic gratings interrogated in the optical switch configuration
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9919053/
https://www.ncbi.nlm.nih.gov/pubmed/36772228
http://dx.doi.org/10.3390/s23031188
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