Piece of cake: Arrays of long nanotubes may help measure terahertz laser power
Tuesday, July 19, 2011 - 17:00
in Physics & Chemistry
Terahertz radiation can penetrate numerous materialsplastic, clothing, paper and some biological tissuesmaking it an attractive candidate for applications such as concealed weapons detection, package inspection and imaging skin tumors. However, to date there is no standard method for measuring the absolute output power of terahertz lasers, one source of this type of radiation. Now, researchers at the National Institute of Standards and Technology (NIST) have found that dense arrays of extra-long carbon nanotubes absorb nearly all light of long wavelengths, and thus are promising coatings for prototype detectors intended to measure terahertz laser power.