Long-range surface plasmon resonance and surface-enhanced Raman scattering on X-shaped gold plasmonic nanohole arrays
| Autor: | Daniel David Galvan, Chao Hou, Guowen Meng, Qiuming Yu |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
business.industry Surface plasmon General Physics and Astronomy 02 engineering and technology Substrate (electronics) 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Rhodamine 6G symbols.namesake chemistry.chemical_compound Optics chemistry symbols Optoelectronics Physical and Theoretical Chemistry Surface plasmon resonance 0210 nano-technology business Refractive index Raman scattering Plasmon Electron-beam lithography |
| Zdroj: | Physical Chemistry Chemical Physics. 19:24126-24134 |
| ISSN: | 1463-9084 1463-9076 |
| DOI: | 10.1039/c7cp04564f |
| Popis: | A multilayered architecture including a thin Au film supporting an X-shaped nanohole array and a thick continuous Au film separated by a Cytop dielectric layer is reported in this work. Long-range surface plasmon resonance (LR-SPR) was generated at the top Au/water interface, which also resulted in a long-range surface-enhanced Raman scattering (LR-SERS) effect. LR-SPR originates from the coupling of surface plasmons (SPs) propagating along the opposite sides of the thin Au film embedded in a symmetric refractive index environment with Cytop (n = 1.34) and water (n = 1.33). The finite-difference time-domain (FDTD) simulation method was used to investigate the optimal dimensions of the substrate by studying the reflectance spectra and electric field profiles. The calculated optimal structure was then fabricated via electron beam lithography, and its LR-SERS performance was demonstrated by detecting rhodamine 6G and 4-mercaptobenzoic acid in the refractive index-matched environment. We believe that this structure as a LR-SPR or LR-SERS substrate can have broad applications in biosensing. |
| Databáze: | OpenAIRE |
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