Chiroptical transmission through a plasmonic helical traveling-wave nanoantenna, towards on-tip chiroptical probes.
Clicks: 245
ID: 66614
2019
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.
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| Authors | Wang, Mengjia;Salut, Roland;Suarez, Miguel Angel;Martin, Nicolas;Grosjean, Thierry; |
| Journal | optics letters |
| Year | 2019 |
| DOI | 10.1364/OL.44.004861 |
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