Figure 2
From: Contactless and spatially structured cooling by directing thermal radiation
Schematic of the setup and resulting cooling pattern. (a) An elliptical mirror collects the thermal radiation emitted by a room temperature sample positioned at the focus point F1. The radiation is focused onto a sample at the second focal point F2, which is placed inside the cold region of a cryostat. A germanium window transparent for IR radiation (9–11 µm) seals the cryostat (SI, Figure S1). An additional mirror allows simultaneous temperature measurements with an IR camera. (b) Photograph of the “metal velvet” sample. (c) IR camera image of the sample at position F1. (d) IR camera image of the sample at position F*. The localized cold area vanishes when the substrate is placed out of focus.
