Chiroptical transmission through a plasmonic helical traveling-wave nanoantenna, towards on-tip chiroptical probes.

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ID: 66614
2019
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Abstract
Resonant plasmonic helices have been widely utilized for locally enhancing and tailoring optical chirality. Here we investigate their nonresonant operation through the recently introduced concept of a plasmonic helical "traveling-wave" nanoantenna. Relying on the coupling of a nonresonant plasmonic helix and a nano-aperture, the helical traveling-wave nanoantenna transmits circularly polarized light with the same handedness as the helix and blocks the other, with a measured dissymmetry factor larger than 1.92 (maximum value of 2). This chiroptical transmission is spatially localized, spectrally broadband, and background-free. Finally, we demonstrate the possibility to engineer such a plasmonic helical nanoantenna at the apex of a sharp tip typically used in scanning near-field microscopies, thus opening the route for moveable, broadband, and background-free chiroptical probes.
Reference Key
wang2019chiropticaloptics Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Wang, Mengjia;Salut, Roland;Suarez, Miguel Angel;Martin, Nicolas;Grosjean, Thierry;
Journal optics letters
Year 2019
DOI
10.1364/OL.44.004861
URL
Keywords
nanoantenna thermal emission boron nitride nanotubes high temperature radiator phonon polaritons thermal photonics

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