Metasurfaces are formed by etching the surface of a material with an elegant pattern of periodic shapes. The particular dimensions of these patterns and their proximity to each other can be tuned to provide “near-unity” (almost complete) energy absorption.
Applications include wireless power transfer to power remote devices such as RFID and remote devices, and even to beam “space solar power” down from space, Ramahi noted.
The technology can also be extended to the infrared and visible spectra. “We’ve already extended our work into the infrared frequency regime and we hope to report very soon about near-unity absorption in those higher-frequency regimes,” added Ramahi.