Interplays of dipole and charge-transfer-plasmon modes in capacitively and conductively coupled dimer with high aspect ratio nanogaps
Charge transfer plasmons (CTPs) in coupled plasmonic cavities have gained attention for their interesting resonance mechanisms and potential applications in sensing. The authors present the first investigation of the CTP mode in top-down fabricated tall plasmonic nanostructures with deep nanogaps, w...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2022
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| Online Access: | https://hdl.handle.net/10356/159912 |
| _version_ | 1826114030127808512 |
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| author | Tobing, Landobasa Yosef Mario Soehartono, Alana Mauluidy Mueller, Aaron David Czyszanowski, Tomasz Yong, Ken-Tye Fan, Weijun Zhang, Dao Hua |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Tobing, Landobasa Yosef Mario Soehartono, Alana Mauluidy Mueller, Aaron David Czyszanowski, Tomasz Yong, Ken-Tye Fan, Weijun Zhang, Dao Hua |
| author_sort | Tobing, Landobasa Yosef Mario |
| collection | NTU |
| description | Charge transfer plasmons (CTPs) in coupled plasmonic cavities have gained attention for their interesting resonance mechanisms and potential applications in sensing. The authors present the first investigation of the CTP mode in top-down fabricated tall plasmonic nanostructures with deep nanogaps, whose excitation becomes possible by the interaction of transversal and longitudinal plasmonic modes. Hybridization of dipole and CTP modes at different parts of the plasmonic nanostructures, for both capacitively coupled dimer of sub-5 nm gap and conductively coupled dimer with junction bridge is extensively studied. Importantly, the authors demonstrate the conditional emergence of a hybrid dimer-CTP mode based on the cladding refractive index and analyte thickness, which can present an opportunity for highly specific surface sensing applications. The sensing performances of these modes are evaluated, showing a figure-of-merit of ≈18.4 and Q ≈ 44 for the hybrid dimer-CTP mode in the visible spectrum. Surface sensing based on alkanethiol adsorption shows surface sensitivity as high as ≈3.2 nm/carbon-chain for this mode, which is higher than the typical values obtained by LSP structures. |
| first_indexed | 2024-10-01T03:32:50Z |
| format | Journal Article |
| id | ntu-10356/159912 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:32:50Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1599122022-07-05T08:06:44Z Interplays of dipole and charge-transfer-plasmon modes in capacitively and conductively coupled dimer with high aspect ratio nanogaps Tobing, Landobasa Yosef Mario Soehartono, Alana Mauluidy Mueller, Aaron David Czyszanowski, Tomasz Yong, Ken-Tye Fan, Weijun Zhang, Dao Hua School of Electrical and Electronic Engineering Engineering::Electrical and electronic engineering Charge Transfer Plasmons Visible Range Charge transfer plasmons (CTPs) in coupled plasmonic cavities have gained attention for their interesting resonance mechanisms and potential applications in sensing. The authors present the first investigation of the CTP mode in top-down fabricated tall plasmonic nanostructures with deep nanogaps, whose excitation becomes possible by the interaction of transversal and longitudinal plasmonic modes. Hybridization of dipole and CTP modes at different parts of the plasmonic nanostructures, for both capacitively coupled dimer of sub-5 nm gap and conductively coupled dimer with junction bridge is extensively studied. Importantly, the authors demonstrate the conditional emergence of a hybrid dimer-CTP mode based on the cladding refractive index and analyte thickness, which can present an opportunity for highly specific surface sensing applications. The sensing performances of these modes are evaluated, showing a figure-of-merit of ≈18.4 and Q ≈ 44 for the hybrid dimer-CTP mode in the visible spectrum. Surface sensing based on alkanethiol adsorption shows surface sensitivity as high as ≈3.2 nm/carbon-chain for this mode, which is higher than the typical values obtained by LSP structures. Agency for Science, Technology and Research (A*STAR) L.Y.M.T. and A.M.S. contributed equally to this work. This work was supported by A*STAR (SERC 1720700038 and A1883c0002), Singapore; and Narodowe Centrum Badań i Rozwoju (NCBR) (HybNanoSens no. DZP/POL-SINIV/283/2017). 2022-07-05T08:06:44Z 2022-07-05T08:06:44Z 2021 Journal Article Tobing, L. Y. M., Soehartono, A. M., Mueller, A. D., Czyszanowski, T., Yong, K., Fan, W. & Zhang, D. H. (2021). Interplays of dipole and charge-transfer-plasmon modes in capacitively and conductively coupled dimer with high aspect ratio nanogaps. Advanced Optical Materials, 9(22), 2100748-. https://dx.doi.org/10.1002/adom.202100748 2195-1071 https://hdl.handle.net/10356/159912 10.1002/adom.202100748 2-s2.0-85114801086 22 9 2100748 en SERC 1720700038 A1883c0002 Advanced Optical Materials © 2021 Wiley-VCH GmbH. All rights reserved. |
| spellingShingle | Engineering::Electrical and electronic engineering Charge Transfer Plasmons Visible Range Tobing, Landobasa Yosef Mario Soehartono, Alana Mauluidy Mueller, Aaron David Czyszanowski, Tomasz Yong, Ken-Tye Fan, Weijun Zhang, Dao Hua Interplays of dipole and charge-transfer-plasmon modes in capacitively and conductively coupled dimer with high aspect ratio nanogaps |
| title | Interplays of dipole and charge-transfer-plasmon modes in capacitively and conductively coupled dimer with high aspect ratio nanogaps |
| title_full | Interplays of dipole and charge-transfer-plasmon modes in capacitively and conductively coupled dimer with high aspect ratio nanogaps |
| title_fullStr | Interplays of dipole and charge-transfer-plasmon modes in capacitively and conductively coupled dimer with high aspect ratio nanogaps |
| title_full_unstemmed | Interplays of dipole and charge-transfer-plasmon modes in capacitively and conductively coupled dimer with high aspect ratio nanogaps |
| title_short | Interplays of dipole and charge-transfer-plasmon modes in capacitively and conductively coupled dimer with high aspect ratio nanogaps |
| title_sort | interplays of dipole and charge transfer plasmon modes in capacitively and conductively coupled dimer with high aspect ratio nanogaps |
| topic | Engineering::Electrical and electronic engineering Charge Transfer Plasmons Visible Range |
| url | https://hdl.handle.net/10356/159912 |
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