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Hybrid Metasurface Based Tunable Near-Perfect Absorber and Plasmonic Sensor

We propose a hybrid metasurface-based perfect absorber which shows the near-unity absorbance and facilities to work as a refractive index sensor. We have used the gold mirror to prevent the transmission and used the amorphous silicon (a-Si) nanodisk arrays on top of the gold mirror which helps to ex...

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Autores principales: Rifat, Ahmmed A., Rahmani, Mohsen, Xu, Lei, Miroshnichenko, Andrey E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6073872/
https://www.ncbi.nlm.nih.gov/pubmed/29954060
http://dx.doi.org/10.3390/ma11071091
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author Rifat, Ahmmed A.
Rahmani, Mohsen
Xu, Lei
Miroshnichenko, Andrey E.
author_facet Rifat, Ahmmed A.
Rahmani, Mohsen
Xu, Lei
Miroshnichenko, Andrey E.
author_sort Rifat, Ahmmed A.
collection PubMed
description We propose a hybrid metasurface-based perfect absorber which shows the near-unity absorbance and facilities to work as a refractive index sensor. We have used the gold mirror to prevent the transmission and used the amorphous silicon (a-Si) nanodisk arrays on top of the gold mirror which helps to excite the surface plasmon by scattering light through it at the normal incident. We numerically investigated the guiding performance. The proposed absorber is polarization independent and shows a maximum absorption of 99.8% at a 932 nm wavelength in the air medium. Considering the real applications, by varying the environments refractive indices from 1.33 to 1.41, the proposed absorber can maintain absorption at more than 99.7%, with a red shift of the resonant wavelength. Due to impedance matching of the electric and magnetic dipoles, the proposed absorber shows near-unity absorbance over the refractive indices range of 1.33 to 1.41, with a zero-reflectance property at a certain wavelength. This feature could be utilized as a plasmonic sensor in detecting the refractive index of the surrounding medium. The proposed plasmonic sensor shows an average sensitivity of 325 nm/RIU and a maximum sensitivity of 350 nm/RIU over the sensing range of 1.33 to 1.41. The proposed metadevice possesses potential applications in solar photovoltaic and photodetectors, as well as in organic and bio-chemical detection.
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spelling pubmed-60738722018-08-13 Hybrid Metasurface Based Tunable Near-Perfect Absorber and Plasmonic Sensor Rifat, Ahmmed A. Rahmani, Mohsen Xu, Lei Miroshnichenko, Andrey E. Materials (Basel) Article We propose a hybrid metasurface-based perfect absorber which shows the near-unity absorbance and facilities to work as a refractive index sensor. We have used the gold mirror to prevent the transmission and used the amorphous silicon (a-Si) nanodisk arrays on top of the gold mirror which helps to excite the surface plasmon by scattering light through it at the normal incident. We numerically investigated the guiding performance. The proposed absorber is polarization independent and shows a maximum absorption of 99.8% at a 932 nm wavelength in the air medium. Considering the real applications, by varying the environments refractive indices from 1.33 to 1.41, the proposed absorber can maintain absorption at more than 99.7%, with a red shift of the resonant wavelength. Due to impedance matching of the electric and magnetic dipoles, the proposed absorber shows near-unity absorbance over the refractive indices range of 1.33 to 1.41, with a zero-reflectance property at a certain wavelength. This feature could be utilized as a plasmonic sensor in detecting the refractive index of the surrounding medium. The proposed plasmonic sensor shows an average sensitivity of 325 nm/RIU and a maximum sensitivity of 350 nm/RIU over the sensing range of 1.33 to 1.41. The proposed metadevice possesses potential applications in solar photovoltaic and photodetectors, as well as in organic and bio-chemical detection. MDPI 2018-06-27 /pmc/articles/PMC6073872/ /pubmed/29954060 http://dx.doi.org/10.3390/ma11071091 Text en © 2018 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Rifat, Ahmmed A.
Rahmani, Mohsen
Xu, Lei
Miroshnichenko, Andrey E.
Hybrid Metasurface Based Tunable Near-Perfect Absorber and Plasmonic Sensor
title Hybrid Metasurface Based Tunable Near-Perfect Absorber and Plasmonic Sensor
title_full Hybrid Metasurface Based Tunable Near-Perfect Absorber and Plasmonic Sensor
title_fullStr Hybrid Metasurface Based Tunable Near-Perfect Absorber and Plasmonic Sensor
title_full_unstemmed Hybrid Metasurface Based Tunable Near-Perfect Absorber and Plasmonic Sensor
title_short Hybrid Metasurface Based Tunable Near-Perfect Absorber and Plasmonic Sensor
title_sort hybrid metasurface based tunable near-perfect absorber and plasmonic sensor
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6073872/
https://www.ncbi.nlm.nih.gov/pubmed/29954060
http://dx.doi.org/10.3390/ma11071091
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