DataVXAdvanced Optical MaterialsPaper
journal article·2018-07Open access

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

Joel T. Collins, Xuezhi Zheng, Nuno V. S. Braz, Eli Slenders, Shuai Zu, Guy A. E. Vandenbosch, Victor V. Moshchalkov, Zheyu Fang, Marcel Ameloot, Paul A. Warburton, Ventsislav K. Valev

Advanced Optical Materials· Volume 6· Issue 14
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Source abstract

Abstract

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.
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Research context

Nanomaterials

OpenAlex topics: Metamaterials and Metasurfaces Applications · Plasmonic and Surface Plasmon Research · Gold and Silver Nanoparticles Synthesis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Centre for Photonics and Photonic Materials and Centre for Nanoscience and Nanotechnology Department of Physics University of Bath BA2 7AY Bath UK

ESAT‐TELEMIC KU Leuven Leuven B‐3001 Belgium

Electrical Engineering University College London Torrington Place London WC1E 7JE UK

London Centre for Nanotechnology University College London 17‐19 Gordon St London WC1H 0AH UK

University Hasselt and Transnational University Limburg BIOMED BE3590 Diepenbeek Belgium

School of Physics State Key Lab for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter Peking University Beijing 100871 China

Laboratory of Solid State Physics and Magnetism KU Leuven Celestijnenlaan 200D Heverlee B‐3001 Belgium

Funding

Engineering and Physical Sciences Research Council · KU Leuven · Fonds Wetenschappelijk Onderzoek

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