Figure 5.

Calculated extinction spectrum of Al/Si nanopillars. ${\lambda }_{exc}$ corresponds to the excitation wavelength (${\lambda }_{exc}$ = 633 nm, continuous red line). ${\lambda }_{Raman2}$ and ${\lambda }_{Raman4}$ correspond to the Raman scattering wavelengths for the Raman shifts of 1025 cm${}^{-1}$ and 1575 cm${}^{-1}$ (${\lambda }_{Raman2}$ = 677 nm, dotted red line, and ${\lambda }_{Raman4}$ = 703 nm, dashed red line), respectively. For the sake of readability, only ${\lambda }_{Raman2}$ and ${\lambda }_{Raman4}$ are displayed, since ${\lambda }_{Raman1}$ and ${\lambda }_{Raman3}$ are very close to ${\lambda }_{Raman2}$.