Are Commonplace Chiral Metal Complexes Unsuitable for Metamaterials?

Among typical metamaterials, we focus on the light "function" and chiral "element" in this chiral light metamaterial minireview. The authors are interested in inorganic materials, especially transition metal complexes. Metal complexes are compounds that have been studied for a long time for their optical properties (light absorption) and chirality (chiroptical spectroscopy, structural crystal chemistry, and asymmetric catalytic reactions). However, since the unit is a "molecule", few examples as (optical) metamaterials have been reported to date. Is it possible to add a function as a composite material using one method? No, the functions resulting from the nano pattern are very difficult to retrofit. Is there a way to fuse the rich compounds at the boundary between inorganic and organic with state-of-the-art optical metamaterials?