Active 10 mm thermal metasurface produces thermal signature of 90 mm object, successfully achieving thermal superscattering

https://phys.org/news/2025-12-thermal-metasurfaces-amplify-signatures-factor.html

"negative thermal conductivity, impossible, needed to make small object look large thermally, instead manipulating heat requires bulky insulation or massive heat spreaders... overcome using 10 mm radius object surrounded by active shell of 10 controllable semiconductor heating/ cooling plates... electronically controlling plates' heat flux mimics negative thermal conductivity mathematical patterns... bypasses natural materials' limits to heat spread control... energy efficient, thermal privacy, ultra-compact"