Tunable optical activity of plasmonic dimers assembled by DNA origami.
We investigate the optical response of gold nanorod (AuNR) dimers assembled in parallel on a DNA origami template. Plasmonic circular dichroism (CD) was found to be highly dependent on the orientation of the dimers relative to the DNA axis and the inter-rod distances. Dipole-dipole distances play a critical role in the induced plasmonic chirality. The orientation dependence of induced CD was further verified by AuNR/Au nanosphere (AuNS) heterodimers. The experimental results of the plasmonic CD agreed well with theoretical calculations.
Department of Physics, East China Normal University, No. 500 Dong Chuan Road, 200241 Shanghai, China. xcxu@phy.ecnu.edu.cn.
Chengcheng
C
Rao
Zhen-Gang
ZG
Wang
Na
N
Li
Wei
W
Zhang
Xuecheng
X
Xu
Baoquan
B
Ding
D002942:Circular Dichroism; D004247:DNA / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D054118:Nanospheres / Q000737:chemistry*; D020349:Surface Plasmon Resonance
D006046:Gold; D004247:DNA