posted on 2021-10-12, 13:36authored byYan Liu, Li Ma, Shuoxing Jiang, Cong Han, Pan Tang, Hao Yang, Xiaoyang Duan, Na Liu, Hao Yan, Xiang Lan
Planar,
thin-layered chiral plasmonic superstructures with complex
two-dimensional (2D) patterns, namely, double-layered binary stars
(bi-stars) and pinwheels, were realized through DNA programmable 2D
supramolecular self-assembly of gold nanorods (AuNRs). The chirality
of the chiral superstructures was defined by a finite number of AuNR
pairs as enantiomeric motifs, and their sizes (∼240 nm) were
precisely defined by the underlying DNA template. These planar, thin-layered
chiral nanoparticle superstructures exhibited prescribed shapes and
sizes at the dried state on the substrate surface and are characteristic
of giant anisotropy of chiroptical responses, with enhanced g-factors from the axial incident excitation as compared
to the in-plane excitation. This work will inspire possibilities for
the construction of 2D chiral materials, for example, chiral metasurfaces,
for the on-chip manipulation of chiral light-matter interactions via programmable self-assembly of nanoparticles.