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In recent years, the widespread availability of multi-dimensional photoelectron spectroscopy has created the opportunity to systematically study the complex interference patterns inherent to multiphoton ionization of atoms and molecules. The dominant interference mechanism in multiphoton ionization leads to discrete peaks in the photoelectron spectrum (PES) that are spaced by the photon energy of...
An organic azo-polymer [1], exhibiting surface relief formation arising from light-induced mass transport through cis-trans photo-isomerization, has been investigated for a variety of applications; this includes optical integrated circuits and holographic data storages. In general, the mass transport driving force acts along a gradient of the optical spatial intensity profile, and it is thus difficult...
A new branch of nonlinear nanophotonics based on high refractive index dielectric nanoparticles is emerging [1]. The unique large resonant enhancement of both electric and magnetic fields associated with very low dissipative losses considerably increases optical interactions at sub-wavelength scales opening new unexplored functionalities. Recently, AlGaAs nanodisks enabled second harmonic generation...
Abrupt modifications of the fields across an interface can be engineered by depositing an array of sub-wavelength resonators specifically tailored to address local amplitude, phase and polarization changes [1]. Physically, ultrathin nanostructure arrays (δ<<λ), also called “optical metasurfaces”, control light by engineering artificial boundary conditions of Maxwell's equations. Metasurfaces...
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