Anti-crossing Effect Dependence of Misalign in Ag Nanoplate Face-to-Face Dimer

Ag nanoplate dimers prepared by self-assembly method have attracted wide attentions. Due to the random effect of this method, the misaligned face-to-face dimer is a common product. The results obtained through modeling the misaligned face-to-face dimer can provide a better understanding about the influence of the misalign effect on the optical property of the dimer. Ag truncated nanoprism dimer studied using finite element method shows an anti-crossing effect with the misalign length less than the height of the truncated nanoprism in the bottom layer. As the truncated nanoprism in the upper layer replaced by a hexagonal nanoplate or nanodisk, the new dimers also show similar anti-crossing effects. This means that Ag nanoplate face-to-face dimer possesses an anti-crossing effect as a function of the misalign length. And the anti-crossing effect is scarcely influenced by the shape of the nanoplate in the upper layer. These results are promising for surface enhanced Raman spectra, surface enhanced fluorescence spectra, novel plasmon rulers, and tunable biosensors.