Electro-Optical Biosensor Based on Embedded Double-Monolayer of Graphene Capacitor in Polymer Technology
In this work, we present an interferometric polymer-based electro-optical device, integrated with an embedded double-monolayer graphene capacitor for biosensing applications. An external voltage across the capacitor applies an electric field to the graphene layers modifying their surface charge dens...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-10-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/13/20/3564 |
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| author | Ary V. R. Portes Ana J. L. Martins Jesus Alvarez Guerrero Mauricio M. Carvalho Ferney O. Amaya-Fernandez Lúcia A. M. Saito Jhonattan C. Ramirez |
| author_facet | Ary V. R. Portes Ana J. L. Martins Jesus Alvarez Guerrero Mauricio M. Carvalho Ferney O. Amaya-Fernandez Lúcia A. M. Saito Jhonattan C. Ramirez |
| author_sort | Ary V. R. Portes |
| collection | DOAJ |
| description | In this work, we present an interferometric polymer-based electro-optical device, integrated with an embedded double-monolayer graphene capacitor for biosensing applications. An external voltage across the capacitor applies an electric field to the graphene layers modifying their surface charge density and the Fermi level position in these layers. This in turn changes the electro-optic properties of the graphene layers making absorption in the waveguide tunable with external voltages. Simultaneously, it is possible to appreciate that this phenomenon contributes to the maximization of the light-graphene interaction by evanescent wave in the sensing area. As a result, it is obtained large phase changes at the output of the interferometer, as a function of small variations in the refractive index in the cladding area, which significantly increasing the sensitivity of the device. The optimum interaction length obtained was 1.24 cm considering a cladding refractive index of 1.33. An absorption change of 129 dB/mm was demonstrated. This result combined with the photonic device based on polymer technology may enable a low-cost solution for biosensing applications in Point of Care (PoC) platform. |
| first_indexed | 2024-03-10T06:14:39Z |
| format | Article |
| id | doaj.art-c78659a368a54734b9c09a9f694c3164 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T06:14:39Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-c78659a368a54734b9c09a9f694c31642023-11-22T19:47:42ZengMDPI AGPolymers2073-43602021-10-011320356410.3390/polym13203564Electro-Optical Biosensor Based on Embedded Double-Monolayer of Graphene Capacitor in Polymer TechnologyAry V. R. Portes0Ana J. L. Martins1Jesus Alvarez Guerrero2Mauricio M. Carvalho3Ferney O. Amaya-Fernandez4Lúcia A. M. Saito5Jhonattan C. Ramirez6Department of Electronic Engineering, School of Engineering, Federal University of Minas Gerais (UFMG), Belo Horizonte 31270-901, MG, BrazilDepartment of Electronic Engineering, School of Engineering, Federal University of Minas Gerais (UFMG), Belo Horizonte 31270-901, MG, BrazilFaculty of Engineering, Universidad Libre, Av. 4 No. 12N-81, Cúcuta 540008, ColombiaMackgraphe, Mackenzie Presbyterian University, São Paulo 01302-907, SP, BrazilEngineering School, Pontifical Bolivarian University, Circular 1 No. 70-01, Medellín 050031, ColombiaMackgraphe, Mackenzie Presbyterian University, São Paulo 01302-907, SP, BrazilDepartment of Electronic Engineering, School of Engineering, Federal University of Minas Gerais (UFMG), Belo Horizonte 31270-901, MG, BrazilIn this work, we present an interferometric polymer-based electro-optical device, integrated with an embedded double-monolayer graphene capacitor for biosensing applications. An external voltage across the capacitor applies an electric field to the graphene layers modifying their surface charge density and the Fermi level position in these layers. This in turn changes the electro-optic properties of the graphene layers making absorption in the waveguide tunable with external voltages. Simultaneously, it is possible to appreciate that this phenomenon contributes to the maximization of the light-graphene interaction by evanescent wave in the sensing area. As a result, it is obtained large phase changes at the output of the interferometer, as a function of small variations in the refractive index in the cladding area, which significantly increasing the sensitivity of the device. The optimum interaction length obtained was 1.24 cm considering a cladding refractive index of 1.33. An absorption change of 129 dB/mm was demonstrated. This result combined with the photonic device based on polymer technology may enable a low-cost solution for biosensing applications in Point of Care (PoC) platform.https://www.mdpi.com/2073-4360/13/20/3564polymeric photonic biosensorselectro-optical componentsgraphene-based capacitorFermi level control |
| spellingShingle | Ary V. R. Portes Ana J. L. Martins Jesus Alvarez Guerrero Mauricio M. Carvalho Ferney O. Amaya-Fernandez Lúcia A. M. Saito Jhonattan C. Ramirez Electro-Optical Biosensor Based on Embedded Double-Monolayer of Graphene Capacitor in Polymer Technology Polymers polymeric photonic biosensors electro-optical components graphene-based capacitor Fermi level control |
| title | Electro-Optical Biosensor Based on Embedded Double-Monolayer of Graphene Capacitor in Polymer Technology |
| title_full | Electro-Optical Biosensor Based on Embedded Double-Monolayer of Graphene Capacitor in Polymer Technology |
| title_fullStr | Electro-Optical Biosensor Based on Embedded Double-Monolayer of Graphene Capacitor in Polymer Technology |
| title_full_unstemmed | Electro-Optical Biosensor Based on Embedded Double-Monolayer of Graphene Capacitor in Polymer Technology |
| title_short | Electro-Optical Biosensor Based on Embedded Double-Monolayer of Graphene Capacitor in Polymer Technology |
| title_sort | electro optical biosensor based on embedded double monolayer of graphene capacitor in polymer technology |
| topic | polymeric photonic biosensors electro-optical components graphene-based capacitor Fermi level control |
| url | https://www.mdpi.com/2073-4360/13/20/3564 |
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