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Origin of the Plasmonic Chirality of Gold Nanorod Trimers Templated by DNA Origami

Author:
Chen, Zhong, Choi, Chun Kit K., Wang, Qiangbin
Source:
ACS applied materials & interfaces 2018 v.10 no.32 pp. 26835-26840
ISSN:
1944-8252
Subject:
DNA, circular dichroism spectroscopy, gold, nanogold, nanorods, optical isomerism
Abstract:
Templated by DNA origami, plasmonic gold nanorods (AuNRs) could be assembled into complex nanostructures with strong chiroptical activities. However, it is still not clear how the plasmonic chirality of a complex nanostructure matters with its daughter structural components. Here, we rationally design and fabricate a series of AuNR trimers and their daughter AuNR dimers. Strikingly, we corroborate by circular dichroism spectroscopy that the plasmonic chirality of asymmetrical AuNR trimers is a nearly perfect summation of the chiroptical response of all their constituent dimeric components. Our results provide fundamental insight into the origin of the plasmonic chirality of complex nanostructures.
Agid:
6089545