@article{Khan2025, 
author = {Majid Khan and Cong Han and Hao Li and Bingqian Dong and Deyan Li and Zakir Khan and Huatian Hu and Jiawei Sun and Weihai Ni and Xiang Lan},
title = {Single-particle insights into the optical activity of planar-layered chiral plasmonic superstructures},
year = {2025},
journal = {Nano Research},
volume = {18},
number = {7},
pages = {94907416},
keywords = {DNA origami, self-assembly, chiral plasmonics, planar-layered superstructures, single-particle spectroscopy},
url = {https://www.sciopen.com/article/10.26599/NR.2025.94907416},
doi = {10.26599/NR.2025.94907416},
abstract = {Planar assemblies of plasmonic nanoparticles have provided opportunities in various fields. This study exploits the self-assembly of gold nanorods (AuNRs) into planar, layered chiral superstructures (dodecamer) using DNA origami technology. Due to the collective plasmonic coupling modes, the dodecamers exhibit g-factors of up to +0.06, which is 4–5 times higher than those of the dextrodimers. The chiroptical property of the superstructures proved to be strongly size-dependent, exhibiting enhanced g-factors with increasing the size of AuNRs. Moreover, by excluding the averaging and close-to-racemic effects in the ensemble colloids, circular differential scattering (CDS) and circularly polarized luminescence (CPL) were studied at the single-particle level, revealing the essential role of the structural chirality of superstructure in correlating single-particle scattering with nearby dye emission. The observed correlated CDS and CPL show g-factors up to −0.17 and −0.6, respectively. These results highlight the potential of DNA origami-directed plasmonic assemblies for nanoscale chirality engineering, with applications in biosensing, chiral photonics, and metamaterials.}
}