Chiroptical transmission through a plasmonic helical traveling-wave nanoantenna, towards on-tip chiroptical probes.
Opt Lett
; 44(19): 4861-4864, 2019 Oct 01.
Article
en En
| MEDLINE
| ID: mdl-31568461
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.
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01-internacional
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MEDLINE
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En
Revista:
Opt Lett
Año:
2019
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Article