Molecular Monolayer Sensing Using Surface Plasmon Resonance and Angular Goos-Hänchen Shift
We demonstrate potential molecular monolayer detection using measurements of surface plasmon resonance (SPR) and angular Goos-Hänchen (GH) shift. Here, the molecular monolayer of interest is a benzenethiol self-assembled monolayer (BT-SAM) adsorbed on a gold (Au) substrate. Excitation of surface pla...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-07-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/21/13/4593 |
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| author | Cherrie May Olaya Norihiko Hayazawa Maria Vanessa Balois-Oguchi Nathaniel Hermosa Takuo Tanaka |
| author_facet | Cherrie May Olaya Norihiko Hayazawa Maria Vanessa Balois-Oguchi Nathaniel Hermosa Takuo Tanaka |
| author_sort | Cherrie May Olaya |
| collection | DOAJ |
| description | We demonstrate potential molecular monolayer detection using measurements of surface plasmon resonance (SPR) and angular Goos-Hänchen (GH) shift. Here, the molecular monolayer of interest is a benzenethiol self-assembled monolayer (BT-SAM) adsorbed on a gold (Au) substrate. Excitation of surface plasmons enhanced the GH shift which was dominated by angular GH shift because we focused the incident beam to a small beam waist making spatial GH shift negligible. For measurements in ambient, the presence of BT-SAM on a Au substrate induces hydrophobicity which decreases the likelihood of contamination on the surface allowing for molecular monolayer sensing. This is in contrast to the hydrophilic nature of a clean Au surface that is highly susceptible to contamination. Since our measurements were made in ambient, larger SPR angle than the expected value was measured due to the contamination in the Au substrate. In contrast, the SPR angle was smaller when BT-SAM coated the Au substrate due to the minimization of contaminants brought about by Au surface modification. Detection of the molecular monolayer acounts for the small change in the SPR angle from the expected value. |
| first_indexed | 2024-03-10T09:49:44Z |
| format | Article |
| id | doaj.art-4a8a69b2732648d3a49a42087cc33bbe |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T09:49:44Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-4a8a69b2732648d3a49a42087cc33bbe2023-11-22T02:51:47ZengMDPI AGSensors1424-82202021-07-012113459310.3390/s21134593Molecular Monolayer Sensing Using Surface Plasmon Resonance and Angular Goos-Hänchen ShiftCherrie May Olaya0Norihiko Hayazawa1Maria Vanessa Balois-Oguchi2Nathaniel Hermosa3Takuo Tanaka4National Institute of Physics, University of the Philippines Diliman, Quezon City 1101, PhilippinesNational Institute of Physics, University of the Philippines Diliman, Quezon City 1101, PhilippinesInnovative Photon Manipulation Research Team, RIKEN Center for Advanced Photonics, Wako 351-0198, JapanNational Institute of Physics, University of the Philippines Diliman, Quezon City 1101, PhilippinesNational Institute of Physics, University of the Philippines Diliman, Quezon City 1101, PhilippinesWe demonstrate potential molecular monolayer detection using measurements of surface plasmon resonance (SPR) and angular Goos-Hänchen (GH) shift. Here, the molecular monolayer of interest is a benzenethiol self-assembled monolayer (BT-SAM) adsorbed on a gold (Au) substrate. Excitation of surface plasmons enhanced the GH shift which was dominated by angular GH shift because we focused the incident beam to a small beam waist making spatial GH shift negligible. For measurements in ambient, the presence of BT-SAM on a Au substrate induces hydrophobicity which decreases the likelihood of contamination on the surface allowing for molecular monolayer sensing. This is in contrast to the hydrophilic nature of a clean Au surface that is highly susceptible to contamination. Since our measurements were made in ambient, larger SPR angle than the expected value was measured due to the contamination in the Au substrate. In contrast, the SPR angle was smaller when BT-SAM coated the Au substrate due to the minimization of contaminants brought about by Au surface modification. Detection of the molecular monolayer acounts for the small change in the SPR angle from the expected value.https://www.mdpi.com/1424-8220/21/13/4593surface plasmon resonancegoos-hänchen shiftfresnelplasmonself-assembled monolayer |
| spellingShingle | Cherrie May Olaya Norihiko Hayazawa Maria Vanessa Balois-Oguchi Nathaniel Hermosa Takuo Tanaka Molecular Monolayer Sensing Using Surface Plasmon Resonance and Angular Goos-Hänchen Shift Sensors surface plasmon resonance goos-hänchen shift fresnel plasmon self-assembled monolayer |
| title | Molecular Monolayer Sensing Using Surface Plasmon Resonance and Angular Goos-Hänchen Shift |
| title_full | Molecular Monolayer Sensing Using Surface Plasmon Resonance and Angular Goos-Hänchen Shift |
| title_fullStr | Molecular Monolayer Sensing Using Surface Plasmon Resonance and Angular Goos-Hänchen Shift |
| title_full_unstemmed | Molecular Monolayer Sensing Using Surface Plasmon Resonance and Angular Goos-Hänchen Shift |
| title_short | Molecular Monolayer Sensing Using Surface Plasmon Resonance and Angular Goos-Hänchen Shift |
| title_sort | molecular monolayer sensing using surface plasmon resonance and angular goos hanchen shift |
| topic | surface plasmon resonance goos-hänchen shift fresnel plasmon self-assembled monolayer |
| url | https://www.mdpi.com/1424-8220/21/13/4593 |
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