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Issue 43, 2015
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Tailoring chiro-optical effects by helical nanowire arrangement

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Abstract

In this work, we experimentally investigate the chiro-optical properties of 3D metallic helical systems at optical frequencies. Both single and triple-nanowire geometries have been studied. In particular, we found that in single-helical nanostructures, the enhancement of chiro-optical effects achievable by geometrical design is limited, especially with respect to the operation wavelength and the circular polarization conversion purity. Conversely, in the triple-helical nanowire configuration, the dominant interaction is the coupling among the intertwined coaxial helices which is driven by a symmetric spatial arrangement. Consequently, a general improvement in the g-factor, extinction ratio and signal-to-noise-ratio is achieved in a broad spectral range. Moreover, while in single-helical nanowires a mixed linear and circular birefringence results in an optical activity strongly dependent on the sample orientation and wavelength, in the triple-helical nanowire configuration, the obtained purely circular birefringence leads to a large optical activity up to 8°, independent of the sample angle, and extending in a broad band of 500 nm in the visible range. These results demonstrate a strong correlation between the configurational internal interactions and the chiral feature designation, which can be effectively exploited for nanoscale chiral device engineering.

Graphical abstract: Tailoring chiro-optical effects by helical nanowire arrangement

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Supplementary files

Article information


Submitted
12 Jul 2015
Accepted
21 Sep 2015
First published
25 Sep 2015

Nanoscale, 2015,7, 18081-18088
Article type
Paper
Author version available

Tailoring chiro-optical effects by helical nanowire arrangement

M. Esposito, V. Tasco, F. Todisco, A. Benedetti, I. Tarantini, M. Cuscunà, L. Dominici, M. De Giorgi and A. Passaseo, Nanoscale, 2015, 7, 18081 DOI: 10.1039/C5NR04674B

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