Microwave Spectroscopy of a Single Permalloy Chiral Metamolecule on a Coplanar Waveguide

A metamaterial's properties primarily originate from those of its component metamolecules, which makes single-metamolecule spectroscopy important for input in designing a metamaterial. However, detailed spectroscopic studies have been out of reach, due to the difficulties in manipulating individual micrometer-scale metamolecules. This work utilizes a coplanar waveguide to study the microwave transmission spectrum of a single magnetic chiral metamolecule, revealing its magnetic resonance and nonreciprocity signals. This approach could have real impact on high-throughput metamaterial engineering.