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(a) The Raman scattering in the nanoparticle system. The hot spots are directly exposed to the detector; (b) the Raman scattering in nanorod array-film system. The absorbance may play an important role.
(a) The SEM top-view image of the Ag nanorod array-film substrate fabricated by OAD; (b) the schematics of structure model used in the FDTD calculations.
The field magnitude distributions under different polarization incidences at different cross sections: (a) -polarization incidence and the cross sections along the axis of nanorods A, B, and C; (b) -polarization incidence and the cross section parallel to plane-crossing nanorods D, E, F, B, and G; (c) -polarization incidence with the same cross section as (b); and (d) -polarization incidence with the same cross section as (a). Experimentally, the SERS integrated intensity for -polarization incidence counts and counts for -polarization incidence at Raman peak .
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