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Enantiomorphing Chiral Plasmonic Nanostructures: A Counterintuitive Sign Reversal of the Nonlinear Circular Dichroism

Collins, JT; Zheng, X; Braz, NVS; Slenders, E; Zu, S; Vandenbosch, GAE; Moshchalkov, VV; ... Valev, VK; + view all (2018) Enantiomorphing Chiral Plasmonic Nanostructures: A Counterintuitive Sign Reversal of the Nonlinear Circular Dichroism. Advanced Optical Materials , 6 (14) , Article 1800153. 10.1002/adom.201800153. Green open access

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Abstract

Plasmonic nanostructures have demonstrated a remarkable ability to control light in ways never observed in nature, as the optical response is closely linked to their flexible geometric design. Due to lack of mirror symmetry, chiral nanostructures allow twisted electric field “hotspots” to form at the material surface. These hotspots depend strongly on the optical wavelength and nanostructure geometry. Understanding the properties of these chiral hotspots is crucial for their applications; for instance, in enhancing the optical interactions with chiral molecules. Here, the results of an elegant experiment are presented: by designing 35 intermediate geometries, the structure is “enantiomorphed” from one handedness to the other, passing through an achiral geometry. Nonlinear multiphoton microscopy is used to demonstrate a new kind of double‐bisignate circular dichroism due to enantiomorphing, rather than wavelength change. From group theory, a fundamental origin of this plasmonic chiroptical response is proposed. The analysis allows the optimization of plasmonic chiroptical materials.

Type: Article
Title: Enantiomorphing Chiral Plasmonic Nanostructures: A Counterintuitive Sign Reversal of the Nonlinear Circular Dichroism
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/adom.201800153
Publisher version: https://doi.org/10.1002/adom.201800153
Language: English
Additional information: Copyright © 2019 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 (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Keywords: Science & Technology, Technology, Physical Sciences, Materials Science, Multidisciplinary, Optics, Materials Science, chirality, chiroptical effects, metamaterials, nonlinear optics, plasmonic, STRATIFIED DIELECTRIC MEDIUM, OPTICAL-ACTIVITY, 2ND-HARMONIC GENERATION, METAL NANOSTRUCTURES, NEGATIVE REFRACTION, METAMATERIALS, FIELD, AMPLIFICATION, SPECTROSCOPY, NANOANTENNAS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10064682
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