Structured Metal Film as a Perfect Absorber (Adv. Mater. 29/2013)

A new 3D absorber, four-tined fish-spear-like resonators (FFRs) is constructed by a two-photon polymerization process. More than 90% absorbance is realized and the resonance occurs in the space around the tines, as reported by Mu Wang and co-workers on page 3994. In this way the heat transferred from the absorbed energy can be dissipated easily. Since a continuous metallic thin film covers the structure, it is perfectly thermo- and electroconductive. These features are strongly desired in many applications.