Theory of chiral plasmonic nanostructures comprising metal nanocrystals and chiral molecular media

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Alexander O Govorov, Zhiyuan Fan

Abstract

Plasmonic nanocrystals strongly interact with chiral molecular shells through electric and magnetic fields and in this way acquire new chiro-optical properties. Transfer of chirality from biomolecules to the plasmonic resonances is a collective phenomenon and strongly depends on the geometry of nanostructure. Collective effects in a molecular chiral shell may suppress or enhance plasmonic circular dichroism (CD) depending on the geometry of hybrid nanocrystal. In large chiral plasmonic structures, we identify a new electrodynamic mechanism of plasmonic CD that is qualitatively different to the near-field, dipolar mechanism of the plasmonic chirality described by us previously. Our models also show that anisotropic nanocrystals, such as nanorods or oriented molecular shells, have strongly enhanced CD at the plasmonic frequency. A family of chiral plasmonic nanostructures proposed and modeled here can be used for designing new optical media and chiral sensors.

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Citations

Jun 20, 2013·Nano Letters·Fang LuOleg Gang
Jan 16, 2014·Nanoscale·Xibo ShenNa Liu
Jun 22, 2013·Chemical Society Reviews·Assaf Ben-MosheGil Markovich
Dec 2, 2015·Scientific Reports·Xiaorui TianMengtao Sun
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Oct 9, 2012·Journal of the American Chemical Society·Ben M MaozGil Markovich
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May 22, 2018·Chirality·Giovanni PellegriniPaolo Biagioni
Jul 14, 2018·Nanoscale·Zilong WuYuebing Zheng
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Mar 1, 2017·Optics Express·Alexander I ShlykovIvan D Rukhlenko
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Apr 3, 2021·Nature Communications·Kevin MartensTim Liedl
Feb 28, 2017·ACS Photonics·Christian KramerTobias Brixner
Jul 2, 2020·Nano Letters·Sotiris Droulias, Lykourgos Bougas

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