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Polarized Nonlinear Nanoscopy of Metal Nanostructures

N. K. Balla ; C. Rendon-Barraza ; L. M. Hoang ; Pawel Karpinski (Institutionen för fysik, Bionanofotonik (Chalmers)) ; E. Bermudez-Urena ; S. Brasselet
Acs Photonics (2330-4022). Vol. 4 (2017), 2, p. 292-301.
[Artikel, refereegranskad vetenskaplig]

Nonlinear signals from metal nanostructures are known to be highly polarization-dependent, due to the intrinsic vectorial nature of nonlinear optical coupling. Nonlinear optical polarization responses contain important information on the near-field properties of nanostructures;, however, they remain complex to monitor and to model at the nanoscale. Polarization resolved nonlinear optical microscopy can potentially address this question; however, the recorded signals are generally averaged over the diffraction-limited size of a few hundreds of nanometers, thus, missing the spatial specificity of the nanostructure's optical response. Here we present a form of polarization resolved microscopy, named polarization nonlinear nanoscopy, which reveals subdiffraction scale vectorial variations of electromagnetic fields, even though the intensity image is diffraction-limited. We show that by exploiting, at a single subdiffraction pixel level, the information gained by the polarization-induced modulation, it is possible to spatially map the vectorial nature of plasmonic nonlinear optical interactions in nanostructures, revealing in particular surface contributions, retardation effects, and anisotropic spatial confinements.

Nyckelord: nonlinear microscopy, second harmonic generation, polariiation, metal, plasmonics, 2nd-harmonic generation microscopy, gold nanoparticles, optical-properties, light, interference, resonances, scattering, modes, particles, oligomers, Science & Technology - Other Topics, Materials Science, Optics, Physics



Denna post skapades 2017-05-12.
CPL Pubid: 249281

 

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Institutioner (Chalmers)

Institutionen för fysik, Bionanofotonik (Chalmers)

Ämnesområden

Hållbar utveckling
Atom- och molekylfysik och optik

Chalmers infrastruktur