The working principle of a bolometer revolves around the thermal detection of radiation. When electromagnetic radiation strikes the absorber material, it causes an increase in temperature. This temperature change leads to a change in the electrical resistance of the material, which can be measured and correlated to the power of the incident radiation. In nanoscale bolometers, the absorber and the thermometer elements are often nanomaterials like graphene, carbon nanotubes, or nanowires.
