We present an experimental and theoretical study of plasmonic modes in high aspect ratio nanostructures in the visible wavelength region and demonstrate their high performance for sensing applications. Ordered and well-defined plasmonic structures with various cross-sectional profiles and heights are obtained using a top-down fabrication process. We show that, compared to cylindrical nanorods, structures with split-ring resonator-like cross sections have great potential for powerful sensing due to a pronounced polarization dependence, strong field enhancement, structural tunability, and improved mechanical stability. The plasmonic structures under study exhibit high sensitivities, up to nearly 600 nm/RIU, and figures of merit above 20.
- split-ring resonators
- high aspect ratio
Päivänranta, B., Merbold, H., Giannini, R., Büchi, L., Gorelick, S., David, C., Löffler, J. F., Feurer, T., & Ekinci, Y. (2011). High aspect ratio plasmonic nanostructures for sensing applications. ACS Nano, 5(8), 6374-6382. https://doi.org/10.1021/nn201529x