Novel nano-plasmonic sensing platform based on vertical conductive bridge
- Novel nano-plasmonic sensing platform based on vertical conductive bridge
- 이경석; 황규원; 곽준영; 박종길; 박효승; 정두석
- nano-plasmonic sensing platform; vertical conductive bridge; charge transfer plasmon mode; localized surface plasmon resonance; magnetic resonance mode
- Issue Date
- Scientific Reports
- VOL 11, :3184
- A novel nano-plasmonic sensing platform based on vertical conductive bridge was suggested as an alternative geometry for taking full advantages of unique properties of conductive junction while substantially alleviating burdens in lithographic process. The efects of various geometrical parameters on the plasmonic properties were systematically investigated. Theoretical simulation on this structure demonstrates that the presence of vertical conductive bridge with smaller diameter sandwiched between two adjacent thin nanodiscs excites a bridged mode very similar to the charge transfer plasmon and exhibits a remarkable enhancement in the extinction efciency and the sensitivity when the electric feld of incident light is parallel to the conductive bridge. Furthermore, for the electric feld perpendicular to the bridge, another interesting feature is observed that two magnetic resonance modes are excited symmetrically through open-gaps on both sides of the bridge together with strongly enhanced electric feld intensity, which provides a very favorable environment as a surface enhanced Raman scattering substrate for fuid analysis. These results verify a great potential and versatility of our approach for use as a nanoplasmonic sensing platform. In addition, we demonstrated the feasibility of fabrication process of vertical conductive bridge and high tunability in controlling the bridge width.
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