  We report the first preparation of nanoporous Al-Mg alloy films by selective
dissolution of Mg from a Mg-rich AlxMg1-x alloy. We show how to tune the
stoichiometry, the porosity and the oxide contents in the final film by
modulating the starting ratio between Al and Mg and the dealloying procedure.
The obtained porous metal can be exploited for enhanced UV spectroscopy. In
this respect, we experimentally demonstrate its efficacy in enhancing
fluorescence and surface Raman scattering for excitation wavelengths of 360 nm
and 257 nm respectively. Finally, we numerically show the superior performance
of the nanoporous Al-Mg alloy in the UV range when compared to equivalent
porous gold structures. The large area to surface ratio provided by this
material make it a promising platform for a wide range of applications in
UV/deep-UV plasmonics.
