In
this work, we study experimentally and theoretically the enhanced
light absorption on a supported random plasmonic monolayer made of
gold nanospheres in a total internal reflection configuration. The
underlying physics can be understood in terms of leaky lossy guided
modes excited in the monolayer, arising due to a balanced interplay
of the nanoparticles’ near-field coupling and scattering. The
experimental results are supported by analytical calculations carried
out with two different models: an effective medium model, known as
the dipolar model, and the so-called coherent scattering model, which
is an approximate solution to a set of multiple-scattering equations.
The metasurfaces we propose in this work might represent significant
application opportunities in many technological areas, including refractive
index and molecular sensing, plasmon-enhanced chemistry, surface-enhanced
Raman spectroscopy (SERS), tunable mirrors, and light-harvesting devices.
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