Perspective on near-field radiative heat transfer

Although near-field radiative heat transfer was introduced in the 1950's, interest field has recently revived, as effect promises improved performance various applications where contactless temperature regulation small-scale is a requirement. With progress computational electromagnetics well nanoinstrumentation, it become possible to simulate complex configurations and measure with high precision. In this Perspective, we highlight key theoretical experimental advances field, discuss important developments tailoring enhancing thermal emission transfer. We opportunities heat-to-electricity energy conversion thermophotovoltaic systems, non-reciprocal transfer, two of many recent focus topics field. Finally, challenges emerging materials, for probing relevant technologies large-scale.