From individual to collective chirality in metal nanoparticles. Recent reports have illustrated the promising potential of chiral metal nanostructures, which exploit the characteristic localized surface plasmon resonance of metal colloids, to produce intense optical activity. In this article we review the concepts, synthetic methods, and theoretical predictions underlying the chirality of metal colloids with a particular emphasis on the size range of 10–100 nanometers. Collective chirality and the associated optical activity in nanoparticle assemblies is a promising alternative that has seen a few recent experimental demonstrations. We conclude with a perspective on chiral nanostructures built up from achiral anisotropic metal particles.
Chiral amplification has been often achieved with metal nanoparticles (NPs). The chiroptical activity of NPs may be of individual or collective origin. In collaboration with Prof L. Liz , we used gold nanorods (NRs) to obtain outstanding chiroptical responses.
Theoretical investigation of the optical activity of a dimer of plasmonic nanoantennas. In this respect we continue on exploring collective chirality with plasmonic nanoparticles (NPs). On the other hand, we are also interested on the individual chirality. As an application of chiral allenophanes we will decorate them with thiol groups to enable their attachment to the NPs surface. Adsorption onto NPs may greatly amplify the optical activity of these novel chiral macromolecules.