Imaging of electric and magnetic fields near plasmonic nanowires

Kabakova, Irina V and De Hoogh, Anouk and Van Der Wel, Ruben E C and Wulf, Matthias and Le Feber, Boris and Kuipers, Laurens K (2016) Imaging of electric and magnetic fields near plasmonic nanowires. Scientific Reports, 6. Article number: 22665 . ISSN 20452322

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Near-field imaging is a powerful tool to investigate the complex structure of light at the nanoscale. Recent advances in near-field imaging have indicated the possibility for the complete reconstruction of both electric and magnetic components of the evanescent field. Here we study the electro-magnetic field structure of surface plasmon polariton waves propagating along subwavelength gold nanowires by performing phase- and polarization-resolved near-field microscopy in collection mode. By applying the optical reciprocity theorem, we describe the signal collected by the probe as an overlap integral of the nanowire's evanescent field and the probe's response function. As a result, we find that the probe's sensitivity to the magnetic field is approximately equal to its sensitivity to the electric field. Through rigorous modeling of the nanowire mode as well as the aperture probe response function, we obtain a good agreement between experimentally measured signals and a numerical model. Our findings provide a better understanding of aperture-based near-field imaging of the nanoscopic plasmonic and photonic structures and are helpful for the interpretation of future near-field experiments.

Item Type: Article
Subjects: 500 Science > 530 Physics > 539 Modern physics
Research Group: Fink Group
SWORD Depositor: Sword Import User
Depositing User: Sword Import User
Date Deposited: 06 Dec 2016 10:06
Last Modified: 05 Sep 2017 09:10

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