Assessing the plasmonics of gold nano-triangles with higher order laser modes
| Autor: | Alfred J. Meixner, Andreas Kolloch, Johannes Boneberg, Dai Zhang, Josip Mihaljevic, Paul Leiderer, L. E. Hennemann, Andreas M. Kern |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
surface-enhanced Raman scattering
Materials science Microscope near field General Physics and Astronomy Physics::Optics localised surface plasmons lcsh:Chemical technology lcsh:Technology Full Research Paper law.invention symbols.namesake Optics Optical microscope law Nanotechnology ddc:530 General Materials Science Fischer pattern lcsh:TP1-1185 Electrical and Electronic Engineering lcsh:Science Plasmon business.industry lcsh:T Laser lcsh:QC1-999 Optical axis Nanoscience symbols lcsh:Q Raman spectroscopy Luminescence business Raman scattering lcsh:Physics higher order laser modes |
| Zdroj: | Beilstein Journal of Nanotechnology, Vol 3, Iss 1, Pp 674-683 (2012) Beilstein Journal of Nanotechnology |
| ISSN: | 2190-4286 |
| Popis: | Regular arrays of metallic nano-triangles – so called Fischer patterns – are fabricated by nano-sphere lithography. We studied such gold nano-triangle arrays on silicon or glass substrates. A series of different samples was investigated with a parabolic mirror based confocal microscope where the sample is scanned through the laser focus. By employing higher order laser modes (azimuthally and radially polarised laser beams), we can excite the Fischer patterns using either a pure in-plane (x,y) electric field or a strongly z-directional (optical axis of the optical microscope) electric field. We collected and evaluated the emitted luminescence and thereby investigated the respectively excited plasmonic modes. These varied considerably: firstly with the light polarisation in the focus, secondly with the aspect ratio of the triangles and thirdly with the employed substrate. Moreover, we obtained strongly enhanced Raman spectra of an adenine (sub-)monolayer on gold Fischer patterns on glass. We thus showed that gold Fischer patterns are promising surface-enhanced Raman scattering (SERS) substrates. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|