A Critical Analysis on the Sensitivity Enhancement of Surface Plasmon Resonance Sensors with Graphene
The use of graphene in surface plasmon resonance sensors, covering a metallic (plasmonic) film, has a number of demonstrated advantages, such as protecting the film against corrosion/oxidation and facilitating the introduction of functional groups for selective sensing. Recently, a number of works h...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-07-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/15/2562 |
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| author | Aline dos Santos Almeida Dario A. Bahamon Nuno M. R. Peres Christiano J. S. de Matos |
| author_facet | Aline dos Santos Almeida Dario A. Bahamon Nuno M. R. Peres Christiano J. S. de Matos |
| author_sort | Aline dos Santos Almeida |
| collection | DOAJ |
| description | The use of graphene in surface plasmon resonance sensors, covering a metallic (plasmonic) film, has a number of demonstrated advantages, such as protecting the film against corrosion/oxidation and facilitating the introduction of functional groups for selective sensing. Recently, a number of works have claimed that few-layer graphene can also increase the sensitivity of the sensor. However, graphene was treated as an isotropic thin film, with an out-of-plane refractive index that is identical to the in-plane index. Here, we critically examine the role of single and few layers of graphene in the sensitivity enhancement of surface plasmon resonance sensors. Graphene is introduced over the metallic film via three different descriptions: as an atomic-thick two-dimensional sheet, as a thin effective isotropic material (same conductivity in the three coordinate directions), and as an non-isotropic layer (different conductivity in the perpendicular direction to the two-dimensional plane). We find that only the isotropic layer model, which is known to be incorrect for the optical modeling of graphene, provides sizable sensitivity increases, while the other, more accurate, models lead to a negligible contribution to the sensitivity. |
| first_indexed | 2024-03-09T05:09:10Z |
| format | Article |
| id | doaj.art-8300af48ea9e41fcbef77702a20aa22c |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T05:09:10Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-8300af48ea9e41fcbef77702a20aa22c2023-12-03T12:51:41ZengMDPI AGNanomaterials2079-49912022-07-011215256210.3390/nano12152562A Critical Analysis on the Sensitivity Enhancement of Surface Plasmon Resonance Sensors with GrapheneAline dos Santos Almeida0Dario A. Bahamon1Nuno M. R. Peres2Christiano J. S. de Matos3School of Engineering, Mackenzie Presbyterian University, São Paulo 01302-907, BrazilSchool of Engineering, Mackenzie Presbyterian University, São Paulo 01302-907, BrazilPhysics Department, Minho University, Campus of Gualtar, 4710-057 Braga, PortugalSchool of Engineering, Mackenzie Presbyterian University, São Paulo 01302-907, BrazilThe use of graphene in surface plasmon resonance sensors, covering a metallic (plasmonic) film, has a number of demonstrated advantages, such as protecting the film against corrosion/oxidation and facilitating the introduction of functional groups for selective sensing. Recently, a number of works have claimed that few-layer graphene can also increase the sensitivity of the sensor. However, graphene was treated as an isotropic thin film, with an out-of-plane refractive index that is identical to the in-plane index. Here, we critically examine the role of single and few layers of graphene in the sensitivity enhancement of surface plasmon resonance sensors. Graphene is introduced over the metallic film via three different descriptions: as an atomic-thick two-dimensional sheet, as a thin effective isotropic material (same conductivity in the three coordinate directions), and as an non-isotropic layer (different conductivity in the perpendicular direction to the two-dimensional plane). We find that only the isotropic layer model, which is known to be incorrect for the optical modeling of graphene, provides sizable sensitivity increases, while the other, more accurate, models lead to a negligible contribution to the sensitivity.https://www.mdpi.com/2079-4991/12/15/2562surface plasmon resonancesensitivitygraphenebiosensors |
| spellingShingle | Aline dos Santos Almeida Dario A. Bahamon Nuno M. R. Peres Christiano J. S. de Matos A Critical Analysis on the Sensitivity Enhancement of Surface Plasmon Resonance Sensors with Graphene Nanomaterials surface plasmon resonance sensitivity graphene biosensors |
| title | A Critical Analysis on the Sensitivity Enhancement of Surface Plasmon Resonance Sensors with Graphene |
| title_full | A Critical Analysis on the Sensitivity Enhancement of Surface Plasmon Resonance Sensors with Graphene |
| title_fullStr | A Critical Analysis on the Sensitivity Enhancement of Surface Plasmon Resonance Sensors with Graphene |
| title_full_unstemmed | A Critical Analysis on the Sensitivity Enhancement of Surface Plasmon Resonance Sensors with Graphene |
| title_short | A Critical Analysis on the Sensitivity Enhancement of Surface Plasmon Resonance Sensors with Graphene |
| title_sort | critical analysis on the sensitivity enhancement of surface plasmon resonance sensors with graphene |
| topic | surface plasmon resonance sensitivity graphene biosensors |
| url | https://www.mdpi.com/2079-4991/12/15/2562 |
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