Nanotubes on a microchip, macrophotograph. The circular patch of carbon nanotubes (black) on a pink silicon backing is one component of a new cryogenic radiometer, shown with a coin for scale. Gold coating and metal wiring has yet to be added to the microchip. The radiometer will simplify and lower the cost of disseminating measurements of laser power. This research was carried out at the Physical Measurement Laboratory (PML) of the National Institute of Standards and Technology (NIST). Image published in 2013.