FDTD Analysis of Hotspot-Enabling Hybrid Nanohole-Nanoparticle Structures for SERS Detection
Metallic nanoparticles (MNPs) and metallic nanostructures are both commonly used, independently, as SERS substrates due to their enhanced plasmonic activity. In this work, we introduce and investigate a hybrid nanostructure with strong SERS activity that benefits from the collective plasmonic respon...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-02-01
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| Series: | Biosensors |
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| Online Access: | https://www.mdpi.com/2079-6374/12/2/128 |
| _version_ | 1797482211193126912 |
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| author | Juan Gomez-Cruz Yazan Bdour Kevin Stamplecoskie Carlos Escobedo |
| author_facet | Juan Gomez-Cruz Yazan Bdour Kevin Stamplecoskie Carlos Escobedo |
| author_sort | Juan Gomez-Cruz |
| collection | DOAJ |
| description | Metallic nanoparticles (MNPs) and metallic nanostructures are both commonly used, independently, as SERS substrates due to their enhanced plasmonic activity. In this work, we introduce and investigate a hybrid nanostructure with strong SERS activity that benefits from the collective plasmonic response of the combination of MNPs and flow-through nanohole arrays (NHAs). The electric field distribution and electromagnetic enhancement factor of hybrid structures composed of silver NPs on both silver and gold NHAs are investigated via finite-difference time-domain (FDTD) analyses. This computational approach is used to find optimal spatial configurations of the nanoparticle positions relative to the nanoapertures and investigate the difference between Ag-NP-on-Ag-NHAs and Ag-NP-on-Au-NHAs hybrid structures. A maximum G<sub>SERS</sub> value of 6.8 × 10<sup>9</sup> is achieved with the all-silver structure when the NP is located 0.5 nm away from the rim of the NHA, while the maximum of 4.7 × 10<sup>10</sup> is obtained when the nanoparticle is in full contact with the NHA for the gold-silver hybrid structure. These results demonstrate that the hybrid nanostructures enable hotspot formation with strong SERS activity and plasmonic enhancement compatible with SERS-based sensing applications. |
| first_indexed | 2024-03-09T22:28:03Z |
| format | Article |
| id | doaj.art-878129bfa4304aeaad60074ff4e73f1f |
| institution | Directory Open Access Journal |
| issn | 2079-6374 |
| language | English |
| last_indexed | 2024-03-09T22:28:03Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Biosensors |
| spelling | doaj.art-878129bfa4304aeaad60074ff4e73f1f2023-11-23T19:01:47ZengMDPI AGBiosensors2079-63742022-02-0112212810.3390/bios12020128FDTD Analysis of Hotspot-Enabling Hybrid Nanohole-Nanoparticle Structures for SERS DetectionJuan Gomez-Cruz0Yazan Bdour1Kevin Stamplecoskie2Carlos Escobedo3Department of Chemical Engineering, Queen’s University, 19 Division St., Kingston, ON K7L 3N6, CanadaDepartment of Chemical Engineering, Queen’s University, 19 Division St., Kingston, ON K7L 3N6, CanadaDepartment of Chemistry, Queen’s University, 90 Bader Lane, Kingston, ON K7L 3N6, CanadaDepartment of Chemical Engineering, Queen’s University, 19 Division St., Kingston, ON K7L 3N6, CanadaMetallic nanoparticles (MNPs) and metallic nanostructures are both commonly used, independently, as SERS substrates due to their enhanced plasmonic activity. In this work, we introduce and investigate a hybrid nanostructure with strong SERS activity that benefits from the collective plasmonic response of the combination of MNPs and flow-through nanohole arrays (NHAs). The electric field distribution and electromagnetic enhancement factor of hybrid structures composed of silver NPs on both silver and gold NHAs are investigated via finite-difference time-domain (FDTD) analyses. This computational approach is used to find optimal spatial configurations of the nanoparticle positions relative to the nanoapertures and investigate the difference between Ag-NP-on-Ag-NHAs and Ag-NP-on-Au-NHAs hybrid structures. A maximum G<sub>SERS</sub> value of 6.8 × 10<sup>9</sup> is achieved with the all-silver structure when the NP is located 0.5 nm away from the rim of the NHA, while the maximum of 4.7 × 10<sup>10</sup> is obtained when the nanoparticle is in full contact with the NHA for the gold-silver hybrid structure. These results demonstrate that the hybrid nanostructures enable hotspot formation with strong SERS activity and plasmonic enhancement compatible with SERS-based sensing applications.https://www.mdpi.com/2079-6374/12/2/128metallic nanoparticlesnanohole arraysFDTDSERS-active structureshotspots |
| spellingShingle | Juan Gomez-Cruz Yazan Bdour Kevin Stamplecoskie Carlos Escobedo FDTD Analysis of Hotspot-Enabling Hybrid Nanohole-Nanoparticle Structures for SERS Detection Biosensors metallic nanoparticles nanohole arrays FDTD SERS-active structures hotspots |
| title | FDTD Analysis of Hotspot-Enabling Hybrid Nanohole-Nanoparticle Structures for SERS Detection |
| title_full | FDTD Analysis of Hotspot-Enabling Hybrid Nanohole-Nanoparticle Structures for SERS Detection |
| title_fullStr | FDTD Analysis of Hotspot-Enabling Hybrid Nanohole-Nanoparticle Structures for SERS Detection |
| title_full_unstemmed | FDTD Analysis of Hotspot-Enabling Hybrid Nanohole-Nanoparticle Structures for SERS Detection |
| title_short | FDTD Analysis of Hotspot-Enabling Hybrid Nanohole-Nanoparticle Structures for SERS Detection |
| title_sort | fdtd analysis of hotspot enabling hybrid nanohole nanoparticle structures for sers detection |
| topic | metallic nanoparticles nanohole arrays FDTD SERS-active structures hotspots |
| url | https://www.mdpi.com/2079-6374/12/2/128 |
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