This Duke “D” is being lit by electromagnetic waves that are normally invisible to the human eye. But they can be seen here thanks to a dielectric metamaterial filter created by Willie Padilla. Metamaterials are synthetic materials composed of individual, engineered cells that together produce properties not found in nature. In this case, that’s the ability to absorb energy in any specific range across the electromagnetic spectrum and convert it into heat. By placing this new metamaterial over a heat-sensitive infrared camera, Padilla has created a new way to spot electromagnetic waves that are otherwise impossible to see. Read the paper here.