This research brings us closer to understanding dielectric nanostructures, and the ways light can be manipulated, which is essential for the development of photonic devices, metamaterials and metasurfaces, as well as for solar cells and sensors.
The researchers investigated the electric and magnetic modes supported by single AlGaAs nanoantennas and their hybridization in a dimer configuration. For this research, cathodoluminescence (CL) imaging spectroscopy was used to harness the properties of dielectric nanoantennas by exploring the nature of the resonances supported by single and coupled nanoantennas. Hyperspectral cathodoluminescence imaging was performed in the visible and near-infrared region in order to characterize the response of the nanoantennas. All cathodoluminescence measurements were performed with the SPARC system, a high-performance cathodoluminescence detector.
The cathodoluminescence imaging allowed to gain a better understanding of the optical properties of individual and coupled nanoantennas, which is a necessary step in the further development of nanoantennas with specific emission and confinement characteristics.