  Aluminum nanostructures have recently been at the focus of numerous studies
due to their properties including oxidation stability and surface plasmon
resonances covering the ultraviolet and visible spectral windows. In this
article, we reveal a new facet of this metal relevant for both plasmonics
purpose and photo-thermal conversion. The field distribution of high order
plasmonic resonances existing in two-dimensional Al structures is studied by
nonlinear photoluminescence (nPL) microscopy in a spectral region where
electronic interband transitions occur. The polarization sensitivity of the
field intensity maps shows that the electric field concentration can be
addressed and controlled on-demand. We use a numerical tool based on the Green
dyadic method to analyze our results and to simulate the absorbed energy that
is locally converted into heat. The polarization-dependent temperature increase
of the Al structures is experimentally quantitatively measured, and is in an
excellent agreement with theoretical predictions. Our work highlights Al as a
promising candidate for designing thermal nanosources integrated in coplanar
geometries for thermally assisted nanomanipulation or biophysical applications.
