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Circular Dichroism in Higher-Order Diffraction Beams from Chiral Quasiplanar Nanostructures

Kuppe, C; Williams, C; You, J; Collins, JT; Gordeev, SN; Wilkinson, TD; Panoiu, NC; (2018) Circular Dichroism in Higher-Order Diffraction Beams from Chiral Quasiplanar Nanostructures. Advanced Optical Materials , 6 (11) , Article 1800098. 10.1002/adom.201800098. Green open access

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Abstract

Miniaturization down to the nanoscale has enabled a new paradigm of ultrathin optical devices, capable of manipulating the direction, polarization, and frequency of light. Great interest is drawn by the promising prospects of deep-subwavelength material dimensions. However, interesting properties and opportunities offered by structures with sizes comparable to the wavelength of light appear to have been overlooked. Here, quasiplanar chiral arrays made of gold are considered and show that higher-order diffracted beams can yield extremely large chiroptical responses for optical frequencies. The chosen sample geometry demonstrates spectrally tunable polarization conversion and extremely large circular dichroism. Experimental and numerical data are in good agreement, for both sample chiral forms, and for the complementary geometries under Babinet's principle. Specifically, the experimental results show that the fractional circular dichroism (CD) can be as high as 20%, in the third-order diffraction beam. Based on the numerical results, a great potential for improvement is anticipated, which makes higher-order diffraction CD a very promising candidate for ultrathin optical applications.

Type: Article
Title: Circular Dichroism in Higher-Order Diffraction Beams from Chiral Quasiplanar Nanostructures
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/adom.201800098
Publisher version: http://doi.org/10.1002/adom.201800098
Language: English
Additional information: Copyright © 2018 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10046868
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