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arXiv · 1908.01157

Individual plasmonic helix for probing light chirality

Mengjia Wang·Roland Salut·Miguel Angel Suarez·Nicolas Martin·Thierry Grosjean
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Abstract

We investigate the plasmonic nanohelix as an individual subwavelength element for locally probing light chirality. We show that an hybrid nanoantenna combining a carbon-gold core-shell helix and a plasmonic nanoaperture transmits circularly polarized light with the same handedness as the helix and blocks the other. Such an assymmetric response is spatially localized, spectrally broadband and background-free. Finally, we demonstrate the possibility to engineer an individual plasmonic helix at the apex of a sharp tip typically used in scanning near-field microscopies, thus opening the prospect of moveable local probes for high resolution sensing and mapping of light chirality and chiroptical forces

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Mengjia Wang, Roland Salut, Miguel Angel Suarez, Nicolas Martin, Thierry Grosjean. 2019-08-03. Individual plasmonic helix for probing light chirality. https://arxiv.org/abs/1908.01157

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