Interactions between light and matter play an instrumental role in spectroscopy, sensing,
quantum information processing and lasers. In most of these applications, light is considered …

Surface plasmon resonance (SPR) is the manifestation of a resonance effect due to the
interaction of conduction electrons of metal nanoparticles with incident photons. The …

Free electron beams such as those employed in electron microscopes have evolved into
powerful tools to investigate photonic nanostructures with an unrivaled combination of …

Collective electronic excitations at metal surfaces are well known to play a key role in a wide
spectrum of science, ranging from physics and materials science to biology. Here we focus …

The diversity of light-matter interactions accessible to a system is limited by the small size of
an atom relative to the wavelength of the light it emits, as well as by the small value of the …

The interaction between free electrons and optical fields constitutes a unique platform to
investigate ultrafast processes in matter and explore fundamental quantum phenomena …

Electron energy loss spectroscopy (EELS) performed in a scanning transmission electron
microscope (STEM) has demonstrated unprecedented power in the characterization of …

Plasmons in graphene have intriguing fundamental properties and hold great potential for
applications. They enable strong confinement of electromagnetic energy at subwavelength …

A fundamental building block for nanophotonics is the ability to achieve negative refraction
of polaritons, because this could enable the demonstration of many unique nanoscale …

Using high-resolution reflection electron-energy-loss spectroscopy (HREELS), we compare
experimental results for the wave-vector-dependent behavior of plasmons in a graphene …