Abstract
As plasmonic sensors can take the advantages of the narrow width of dark mode, these sensors have been mostly investigated, and continuous efforts have been devoted to finding nanostructures with a high value of FoM. However, the FoM is ultimately limited by the ohmic loss of metal nanostructure. Based on the experimental and Drude model, the FoM is larger at the near IR range which is especially useful for biological sensors due to water’s transparency. Here, we report the SPR properties of a single Au triangular nano frame. Our results show that all plasmon bands in the examined wavelength have the characteristic of the dark modes. Moreover, we find the especial plasmon bands with high values of FoM. It originates from the anti-bonding coupling of the dipolar and quadropolar mode (ADQ mode) in a single nano frame. The FoM of this dark mode is about 45, the largest FoM’s value reported for a single nanostructure. The ADQ mode shows extreme sensitivity to the thickness of the nano frame and surrounding refractive index, which shows great promise for high sensitivity LSPR sensing.
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Azarian, A., Sheikhy, L. Dark Plasmon with a High Figure of Merit in a Single Au Triangular Nano Frame. J Clust Sci 30, 1633–1639 (2019). https://doi.org/10.1007/s10876-019-01608-6
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DOI: https://doi.org/10.1007/s10876-019-01608-6