Abstract: Combination of materials with radically different physical properties in the same nanostructure gives rise to the so-called Janus effects, allowing phenomena of contrasting nature to occur in the same architecture. Here we will report on how Janus-based nanoheaters possess superior photothermal conversion features and directional heating capacities that can be exploited in highly demanded applications such as photothermal cancer therapies, drug-delivery or heat-gradient-free metasurfaces to control transitions in phase change films without the need of local resistive heaters and external electronics.

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