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Open AccessFeature PaperArticle

Circular Dichroism in Low-Cost Plasmonics: 2D Arrays of Nanoholes in Silver

1
Department S.B.A.I., Sapienza Università di Roma, Via A. Scarpa 14, I-00161 Rome, Italy
2
Physics and Astronomy Department, University of Padova, via Marzolo 8, I-35131 Padova, Italy
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(4), 1316; https://doi.org/10.3390/app10041316
Received: 17 December 2019 / Revised: 9 February 2020 / Accepted: 12 February 2020 / Published: 15 February 2020
Arrays of nanoholes in metal are important plasmonic devices, proposed for applications spanning from biosensing to communications. In this work, we show that in such arrays the symmetry can be broken by means of the elliptical shape of the nanoholes, combined with the in-plane tilt of the ellipse axes away from the array symmetry lines. The array then differently interacts with circular polarizations of opposite handedness at normal incidence, i.e., it becomes intrinsically chiral. The measure of this difference is called circular dichroism (CD). The nanosphere lithography combined with tilted silver evaporation was employed as a low-cost fabrication technique. In this paper, we demonstrate intrinsic chirality and CD by measuring the extinction in the near-infrared range. We further employ numerical analysis to visualize the circular polarization coupling with the nanostructure. We find a good agreement between simulations and the experiment, meaning that the optimization can be used to further increase CD. View Full-Text
Keywords: nanoholes; chirality; plasmonics; circular dichroism nanoholes; chirality; plasmonics; circular dichroism
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Petronijevic, E.; Belardini, A.; Leahu, G.; Cesca, T.; Scian, C.; Mattei, G.; Sibilia, C. Circular Dichroism in Low-Cost Plasmonics: 2D Arrays of Nanoholes in Silver. Appl. Sci. 2020, 10, 1316.

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