Control of the plasmonic near-field in metallic nanohelices
Caridad JM, Winters S, Mccloskey D, Duesberg GS, Donegan JF, Krstic V (2018)
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2018
Journal
Publisher: Institute of Physics Publishing
Book Volume: 29
Article Number: 325204
Journal Issue: 32
Abstract
The optical response of metallic nanohelices is mainly governed by a longitudinal localised surface plasmon resonance (LSPR) which arises due to the helical anisotropy of the system. Up to now, experimental studies have predominantly addressed the far-field response, despite the fact that the LSPR being of broad interest for converting incoming light into strongly enhanced (chiral) optical near-fields. Here, we demonstrate the control and spatial reproducibility of the plasmon-induced electromagnetic near-field around metallic nanohelices via surface-enhanced Raman scattering. We discuss how the near-field intensity of these nanostructures can be custom-tailored through both the nanoscaled helical structure and the electronic properties of the constituting metals. Our experiments, which employ graphene as an accurate probing material, are in quantitative agreement with corresponding numerical simulations. The findings demonstrate metallic nanohelices as reference nanostructured surfaces able to provide and fine-tune optical fields for fundamental studies as well as sensing or (chiro-optical) imaging applications.
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APA:
Caridad, J.M., Winters, S., Mccloskey, D., Duesberg, G.S., Donegan, J.F., & Krstic, V. (2018). Control of the plasmonic near-field in metallic nanohelices. Nanotechnology, 29(32). https://dx.doi.org/10.1088/1361-6528/aac666
MLA:
Caridad, Jose M., et al. "Control of the plasmonic near-field in metallic nanohelices." Nanotechnology 29.32 (2018).
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