Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-10-07
Optics Express 20, 4176 (2012)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
12 pages, 4 figures
Scientific paper
10.1364/OE.20.004176
We study the effect of nonlocal optical response on the optical properties of metallic nanowires, by numerically implementing the hydrodynamical Drude model for arbitrary nanowire geometries. We first demonstrate the accuracy of our frequency-domain finite-element implementation by benchmarking it in a wide frequency range against analytical results for the extinction cross section of a cylindrical plasmonic nanowire. Our main results concern more complex geometries, namely cylindrical and bow-tie nanowire dimers that can strongly enhance optical fields. For both types of dimers we find that nonlocal response can strongly affect both the field enhancement in between the dimers and their respective extinction cross sections. In particular, we give examples of maximal field enhancements near hybridized plasmonic dimer resonances that are still large but nearly two times smaller than in the usual local-response description. At the same time, for a fixed frequency the field enhancement and cross section can also be significantly more enhanced in the nonlocal-response model.
Jauho Antti-Pekka
Mortensen Niels Asger
Raza Søren
Toscano Giuseppe
Wubs Martijn
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