Chiral light intrinsically couples to extrinsic/pseudo-chiral metasurfaces made of tilted gold nanowires

Alessandro Belardini, Marco Centini, Grigore Leahu, David C. Hooper, Roberto Li Voti, Eugenio Fazio, Joseph W. Haus, Andrew Sarangan, Ventsislav K. Valev, Concita Sibilia

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Abstract

Extrinsic or pseudo-chiral (meta)surfaces have an achiral structure, yet they can give rise to circular dichroism when the experiment itself becomes chiral. Although these surfaces are known to yield differences in reflected and transmitted circularly polarized light, the exact mechanism of the interaction has never been directly demonstrated. Here we present a comprehensive linear and nonlinear optical investigation of a metasurface composed of tilted gold nanowires. In the linear regime, we directly demonstrate the selective absorption of circularly polarised light depending on the orientation of the metasurface. In the nonlinear regime, we demonstrate for the first time how second harmonic generation circular dichroism in such extrinsic/pseudo-chiral materials can be understood in terms of effective nonlinear susceptibility tensor elements that switch sign depending on the orientation of the metasurface. By providing fundamental understanding of the chiroptical interactions in achiral metasurfaces, our work opens up new perspectives for the optimisation of their properties.

Original languageEnglish
Article number31796
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - 24 Aug 2016

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polarized light
dichroism
nanowires
gold
harmonic generations
switches
interactions
tensors
magnetic permeability
optimization

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Belardini, A., Centini, M., Leahu, G., Hooper, D. C., Li Voti, R., Fazio, E., ... Sibilia, C. (2016). Chiral light intrinsically couples to extrinsic/pseudo-chiral metasurfaces made of tilted gold nanowires. Scientific Reports, 6, [31796]. https://doi.org/10.1038/srep31796

Chiral light intrinsically couples to extrinsic/pseudo-chiral metasurfaces made of tilted gold nanowires. / Belardini, Alessandro; Centini, Marco; Leahu, Grigore; Hooper, David C.; Li Voti, Roberto; Fazio, Eugenio; Haus, Joseph W.; Sarangan, Andrew; Valev, Ventsislav K.; Sibilia, Concita.

In: Scientific Reports, Vol. 6, 31796, 24.08.2016.

Research output: Contribution to journalArticle

Belardini, A, Centini, M, Leahu, G, Hooper, DC, Li Voti, R, Fazio, E, Haus, JW, Sarangan, A, Valev, VK & Sibilia, C 2016, 'Chiral light intrinsically couples to extrinsic/pseudo-chiral metasurfaces made of tilted gold nanowires', Scientific Reports, vol. 6, 31796. https://doi.org/10.1038/srep31796
Belardini, Alessandro ; Centini, Marco ; Leahu, Grigore ; Hooper, David C. ; Li Voti, Roberto ; Fazio, Eugenio ; Haus, Joseph W. ; Sarangan, Andrew ; Valev, Ventsislav K. ; Sibilia, Concita. / Chiral light intrinsically couples to extrinsic/pseudo-chiral metasurfaces made of tilted gold nanowires. In: Scientific Reports. 2016 ; Vol. 6.
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