  Anisotropic hybrid nanostructures stand out as promising therapeutic agents
in photothermal conversion-based treatments. Accordingly, understanding local
heat generation mediated by light-to-heat conversion of absorbing
multicomponent nanoparticles at the single particle level have both forthwith
become a subject of broad and current interest. Nonetheless, evaluating
reliable temperature profiles around a single trapped nanoparticle is
challenging from all experimental, computational, and fundamental viewpoints.
Committed to filling this gap, the heat generation of an anisotropic hybrid
nanostructure is explored by means of two different experimental approaches
from which the local temperature is measured in a direct or indirect way, all
in the context of the hot Brownian motion theory. The results were compared
with analytical results supported by the numerical computation of the
wavelength-dependent absorption efficiencies in the discrete dipole
approximation for scattering calculations, which has been here extended to
inhomogeneous nanostructures. Overall, we provide a consistent and
comprehensive view of the heat generation in optical traps of highly absorbing
particles under the viewpoint of the hot Brownian motion theory.
