Chiral Gold Nanocups with Large Magnetic Plasmonic Enhancement for Single-Particle Chiroptical Response

However, most chiral plasmonic nanoparticles exhibit electric plasmon resonance modes but lack magnetic plasmon resonance modes, the latter of which are crucial for achieving strong chiroptical responses. Herein we report on a type of chiral Au nanocup structure featuring an asymmetric hollow architecture with a side opening.

The chiral Au nanocups are synthesized by the vertex-initiated overgrowth of Au on PbS nano-octahedra, which is templated by chiral glutathione molecules. The chiral extinction and scattering measurements are conducted at the ensemble and single-particle level, respectively. The scattering dissymmetry factors of individual nanocups supported on silica substrates exhibit a 50-fold enhancement compared to the extinction dissymmetry factor of the ensemble in solution.