Plasmon-induced transparency sensor for detection of minuscule refractive index changes in ultra-low index materials

Plasmon-induced transparency sensor for detection of minuscule refractive index changes in ultra-low index materials

Abstract Detection of low-index materials such as aerogels and also detection of refractive index variations in these materials is still a challenging task. Here, a high figure of merit (FOM) sensor based on plasmon-induced transparency (PIT) is proposed for the detection of aerogel refractive index...

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Autores principales: Shahriar Farhadi, Mehdi Miri, Ali Farmani
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2021
Materias:
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Science
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Acceso en línea:https://doaj.org/article/51b544af816d4906a98383478015c5f4
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spelling oai:doaj.org-article:51b544af816d4906a98383478015c5f42021-11-08T10:47:43ZPlasmon-induced transparency sensor for detection of minuscule refractive index changes in ultra-low index materials10.1038/s41598-021-01246-x2045-2322https://doaj.org/article/51b544af816d4906a98383478015c5f42021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01246-xhttps://doaj.org/toc/2045-2322Abstract Detection of low-index materials such as aerogels and also detection of refractive index variations in these materials is still a challenging task. Here, a high figure of merit (FOM) sensor based on plasmon-induced transparency (PIT) is proposed for the detection of aerogel refractive index changes. In the proposed PIT sensor, the transparency window in an opaque region arises from the coupling between surface plasmon polariton (SPP) mode and planar waveguide mode. By comprising sub-wavelength grating (SWG) in the planar waveguide region, the maximum of the electric field of waveguide occurs in a low index media. This facilitates detection of the aerogels when they are used as the low index material (sensing material). Application of the subwavelength grating waveguide also improves the sensitivity of the sensor by a factor of six compared to a conventional structure with a homogenous waveguide. The proposed structure has a quality factor of Q ≥ 1800, and a reflection of 86%, and can detect the refractive index changes as low as Δn = 0.002 (around n = 1.0). The lineshape, Q-factor, and resonant wavelength of the transparency spectrum can be controlled by tailoring the structural parameters. Our work also has potential application in switching, filtering, and spectral shaping.Shahriar FarhadiMehdi MiriAli FarmaniNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Shahriar Farhadi
Mehdi Miri
Ali Farmani
Plasmon-induced transparency sensor for detection of minuscule refractive index changes in ultra-low index materials
description Abstract Detection of low-index materials such as aerogels and also detection of refractive index variations in these materials is still a challenging task. Here, a high figure of merit (FOM) sensor based on plasmon-induced transparency (PIT) is proposed for the detection of aerogel refractive index changes. In the proposed PIT sensor, the transparency window in an opaque region arises from the coupling between surface plasmon polariton (SPP) mode and planar waveguide mode. By comprising sub-wavelength grating (SWG) in the planar waveguide region, the maximum of the electric field of waveguide occurs in a low index media. This facilitates detection of the aerogels when they are used as the low index material (sensing material). Application of the subwavelength grating waveguide also improves the sensitivity of the sensor by a factor of six compared to a conventional structure with a homogenous waveguide. The proposed structure has a quality factor of Q ≥ 1800, and a reflection of 86%, and can detect the refractive index changes as low as Δn = 0.002 (around n = 1.0). The lineshape, Q-factor, and resonant wavelength of the transparency spectrum can be controlled by tailoring the structural parameters. Our work also has potential application in switching, filtering, and spectral shaping.
format article
author Shahriar Farhadi
Mehdi Miri
Ali Farmani
author_facet Shahriar Farhadi
Mehdi Miri
Ali Farmani
author_sort Shahriar Farhadi
title Plasmon-induced transparency sensor for detection of minuscule refractive index changes in ultra-low index materials
title_short Plasmon-induced transparency sensor for detection of minuscule refractive index changes in ultra-low index materials
title_full Plasmon-induced transparency sensor for detection of minuscule refractive index changes in ultra-low index materials
title_fullStr Plasmon-induced transparency sensor for detection of minuscule refractive index changes in ultra-low index materials
title_full_unstemmed Plasmon-induced transparency sensor for detection of minuscule refractive index changes in ultra-low index materials
title_sort plasmon-induced transparency sensor for detection of minuscule refractive index changes in ultra-low index materials
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/51b544af816d4906a98383478015c5f4
work_keys_str_mv AT shahriarfarhadi plasmoninducedtransparencysensorfordetectionofminusculerefractiveindexchangesinultralowindexmaterials
AT mehdimiri plasmoninducedtransparencysensorfordetectionofminusculerefractiveindexchangesinultralowindexmaterials
AT alifarmani plasmoninducedtransparencysensorfordetectionofminusculerefractiveindexchangesinultralowindexmaterials
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