The prototype device, a miniature version of an instrument called a cryogenic radiometer, is a silicon chip topped with circular mats of carbon nanotubes standing on end. The mini-radiometer builds on NIST's previous work using nanotubes, the world's darkest known substance, to make an ultraefficient, highly accurate optical power detector, and advances NIST's ability to measure laser power delivered through fiber for calibration customers.
"This is our play for leadership in laser power meas...
