ph9b01745_si_001.pdf (93.04 kB)
Probing the Electromagnetic Degree of Coherence of Light Beams with Nanoscatterers
journal contribution
posted on 2020-03-31, 13:07 authored by Kimmo Saastamoinen, Henri Partanen, Ari T. Friberg, Tero SetäläHighly
nonparaxial electromagnetic fields are increasingly met
in modern nanophotonics. Their characterization is vital, but the
traditional beam-field methods are not applicable. In this work we
demonstrate a novel technique to measure the two-point electromagnetic
spatial coherence of random beam fields based on scattering from dipolar
nanoparticles. We consider both unpolarized and fully polarized beams.
The resolution of the technique is limited by the size of the particles,
and the results are shown to agree well with those obtained by a digital
micromirror device. Nanoprobe detection of electromagnetic light fields
is particularly relevant for near-field situations where polarization
and coherence properties are of major importance.