The group led by Associate Professor Tomoya Oshikiri (Planned research B02) and Assistant Professor Hiromasa Niinomi (Publicly offered research C), Tohoku University, has demonstrated that assemblies of isotropic gold nanoparticles exhibit chiral optical responses depending on their arrangement. Typically, the chiral optical response resulting from the arrangement of metal particles is determined by the interactions between the particles. The directional properties of the particles are crucial factors. However, isotopic nanostructures do not show directional properties through their structure. This study utilizes the collective behavior of multiple particles optically coupled with a two-dimensional planar resonator. By arranging isotropic metallic nanodisks on a two-dimensional resonator, the researchers successfully achieved an induction of a chiral optical response similar to that exhibited in geometrically coupled structures.
This research was published in the academic journal “Photochemical & Photobiological Sciences” on December 10th, 2024.

https://link.springer.com/article/10.1007/s43630-024-00667-7