Active coherent control of nanoscale light confinement: Modulation of plasmonic modes and position of hotspots for surface-enhanced Raman scattering detection
- 160 Downloads
Multistep plasmonic nanostructures can induce the deep modulation of electromagnetic-field interactions on the nanoscale for positioning hotspots, and this generation of enhanced fields is important in many optical applications. In this article, a new strategy is proposed for fabricating a plasmonic doublestacked nanocone (DSC) nanostructure. In the DSC structure, a tunable plasmonic hybrid mode proceeds from the strong coupling of the plasmonic resonance of a fundamental cavity mode with a localized surface plasmon gap mode. In the nanostructure, the far-field response is deeply modulated and the hottest spots can be effectively positioned on the top surface of the DSC nanostructure. A controllable and cost-effective mask-reconfiguration technique for manufacturing the multiscale nanostructure is developed, which guarantees the generation of the introduced crucial stage on the DSC nanostructure. To evaluate the features of the plasmonic resonance, the DSC nanostructure is used as a surface-enhanced Raman scattering (SERS) substrate for detecting 4-mercaptopyridine molecules under specific excitation conditions. Its good performance, with an average measured SERS enhancement factor as high as 108, demonstrates its strong plasmonic-mode hybridization and extreme field enhancement.
Keywordssurface plasmons mode hybridization positioning hotspot double-stacked nanocone (DSC) nanostructure surface-enhanced Raman scattering (SERS)
Unable to display preview. Download preview PDF.
We acknowledge support by the National Science & Technology Pillar Program (No. 2011BAK15B02), the Key Research Program of National Nanotechnology and Science (No. 2016YFA0200901), the Research and Applications of the Common Technology of National Quality Infrastructure of China (No. 2016YFF0200602).
- Zhang, Y. C.; Bahk, J. H.; Lee, J.; Birkel, C. S.; Snedaker, M. L.; Liu, D. Y.; Zeng, H. M.; Moskovits, M.; Shakouri, A.; Stucky, G. D. Hot carrier filtering in solution processed heterostructures: Aparadigm for improving thermoelectric efficiency. Adv. Mater. 2014, 26, 2755–2761.CrossRefGoogle Scholar
- Pavaskar, P.; Theiss, J.; Cronin, S. B. Plasmonic hot spots: Nanogap enhancement vs. focusing effects from surrounding nanoparticles. Opt. Express 2012, 20, 14656–14662.Google Scholar
- Valev, V. K.; Sihanek, A. V.; Jeyaram, Y.; Denkova, D.; de Clercq, B.; Petkov, V.; Zheng, X.; Volskiy, V.; Gillijns, W.; Vandenbosch, G. A. E. et al. Hotspot decorations map plasmonic patterns with the resolution of scanning probe techniques. Phys. Rev. Lett. 2011, 106, 226803.CrossRefGoogle Scholar
- Information on https://www.cst.com/Applications/MWandRF (cited 12 Oct. 2016).Google Scholar