Figure 7
(a,c) and (b,d) respectively represent the comparison of Raman enhancement factor curves of Au and Au@Al2O3 dimers with different excitation wavelengths at different distances, with a radius of 50 nm and incident light angle of 0°. The distance between Au@Al2O3 dimer is set as d = 1 nm, and the thickness of Al2O3 shell is r0 = 1 nm and 2 nm respectively, so the distance between Au@Al2O3 dimer Au core is D = 3 nm and 5 nm.
