Numerical Study of Graphene/Au/SiC Waveguide-Based Surface Plasmon Resonance Sensor

A new waveguide-based surface plasmon resonance (SPR) sensor was proposed and investigated by numerical simulation. The sensor consists of a graphene cover layer, a gold (Au) thin film, and a silicon carbide (SiC) waveguide layer on a silicon dioxide/silicon (SiO<sub>2</sub>/Si) substrat...

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Autores principales:	Wei Du, Lucas Miller, Feng Zhao
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	waveguide surface plasmon resonance graphene silicon carbide refractive index chemical sensor Biotechnology TP248.13-248.65
Acceso en línea:	https://doaj.org/article/d531f0b5d08845538ba468a09e10e67f
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spelling	oai:doaj.org-article:d531f0b5d08845538ba468a09e10e67f2021-11-25T16:55:37ZNumerical Study of Graphene/Au/SiC Waveguide-Based Surface Plasmon Resonance Sensor10.3390/bios111104552079-6374https://doaj.org/article/d531f0b5d08845538ba468a09e10e67f2021-11-01T00:00:00Zhttps://www.mdpi.com/2079-6374/11/11/455https://doaj.org/toc/2079-6374A new waveguide-based surface plasmon resonance (SPR) sensor was proposed and investigated by numerical simulation. The sensor consists of a graphene cover layer, a gold (Au) thin film, and a silicon carbide (SiC) waveguide layer on a silicon dioxide/silicon (SiO<sub>2</sub>/Si) substrate. The large bandgap energy of SiC allows the sensor to operate in the visible and near-infrared wavelength ranges, which effectively reduces the light absorption in water to improve the sensitivity. The sensor was characterized by comparing the shift of the resonance wavelength peak with change of the refractive index (RI), which mimics the change of analyte concentration in the sensing medium. The study showed that in the RI range of 1.33~1.36, the sensitivity was improved when the graphene layers were increased. With 10 graphene layers, a sensitivity of 2810 nm/RIU (refractive index unit) was achieved, corresponding to a 39.1% improvement in sensitivity compared to the Au/SiC sensor without graphene. These results demonstrate that the graphene/Au/SiC waveguide SPR sensor has a promising use in portable biosensors for chemical and biological sensing applications, such as detection of water contaminations (RI = 1.33~1.34), hepatitis B virus (HBV), and glucose (RI = 1.34~1.35), and plasma and white blood cells (RI = 1.35~1.36) for human health and disease diagnosis.Wei DuLucas MillerFeng ZhaoMDPI AGarticlewaveguidesurface plasmon resonancegraphenesilicon carbiderefractive indexchemical sensorBiotechnologyTP248.13-248.65ENBiosensors, Vol 11, Iss 455, p 455 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	waveguide surface plasmon resonance graphene silicon carbide refractive index chemical sensor Biotechnology TP248.13-248.65
spellingShingle	waveguide surface plasmon resonance graphene silicon carbide refractive index chemical sensor Biotechnology TP248.13-248.65 Wei Du Lucas Miller Feng Zhao Numerical Study of Graphene/Au/SiC Waveguide-Based Surface Plasmon Resonance Sensor
description	A new waveguide-based surface plasmon resonance (SPR) sensor was proposed and investigated by numerical simulation. The sensor consists of a graphene cover layer, a gold (Au) thin film, and a silicon carbide (SiC) waveguide layer on a silicon dioxide/silicon (SiO<sub>2</sub>/Si) substrate. The large bandgap energy of SiC allows the sensor to operate in the visible and near-infrared wavelength ranges, which effectively reduces the light absorption in water to improve the sensitivity. The sensor was characterized by comparing the shift of the resonance wavelength peak with change of the refractive index (RI), which mimics the change of analyte concentration in the sensing medium. The study showed that in the RI range of 1.33~1.36, the sensitivity was improved when the graphene layers were increased. With 10 graphene layers, a sensitivity of 2810 nm/RIU (refractive index unit) was achieved, corresponding to a 39.1% improvement in sensitivity compared to the Au/SiC sensor without graphene. These results demonstrate that the graphene/Au/SiC waveguide SPR sensor has a promising use in portable biosensors for chemical and biological sensing applications, such as detection of water contaminations (RI = 1.33~1.34), hepatitis B virus (HBV), and glucose (RI = 1.34~1.35), and plasma and white blood cells (RI = 1.35~1.36) for human health and disease diagnosis.
format	article
author	Wei Du Lucas Miller Feng Zhao
author_facet	Wei Du Lucas Miller Feng Zhao
author_sort	Wei Du
title	Numerical Study of Graphene/Au/SiC Waveguide-Based Surface Plasmon Resonance Sensor
title_short	Numerical Study of Graphene/Au/SiC Waveguide-Based Surface Plasmon Resonance Sensor
title_full	Numerical Study of Graphene/Au/SiC Waveguide-Based Surface Plasmon Resonance Sensor
title_fullStr	Numerical Study of Graphene/Au/SiC Waveguide-Based Surface Plasmon Resonance Sensor
title_full_unstemmed	Numerical Study of Graphene/Au/SiC Waveguide-Based Surface Plasmon Resonance Sensor
title_sort	numerical study of graphene/au/sic waveguide-based surface plasmon resonance sensor
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/d531f0b5d08845538ba468a09e10e67f
work_keys_str_mv	AT weidu numericalstudyofgrapheneausicwaveguidebasedsurfaceplasmonresonancesensor AT lucasmiller numericalstudyofgrapheneausicwaveguidebasedsurfaceplasmonresonancesensor AT fengzhao numericalstudyofgrapheneausicwaveguidebasedsurfaceplasmonresonancesensor
_version_	1718412864718372864

Numerical Study of Graphene/Au/SiC Waveguide-Based Surface Plasmon Resonance Sensor

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