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(a), (b), and (c) are three top view SEM images of Au nanopost array with the diameter and separation , 160, and 235 nm, respectively. The scale bar represents 200 nm for all SEM images.
Representative SERS spectra of BPE obtained from the Au nanopost arrays with different separation , 110, 135, 180, and 235 nm, respectively. The spectra are not normalized to the post number.
(a) The relative SERS peak intensity per post at (star), (filled circle), and (filled square), and the rescaled sum of vs calculated by FDTD method (the solid curves). (b) The enhancement of edge and top , and the total enhancement , as functions of the separation , calculated by FDTD method.
(a) The top view and (b) the cross-sectional view of the local E-field distribution of the nanopost array calculated by FDTD method.
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