US Patent 8009284 - CNT electromagnetic sensor

http://www.freepatentsonline.com/8009284.html

This patent from Hon Hai Precision (Foxconn) teaches how carbon nanotube structures can be used to measure the intensity and polarizing direction of electromagnetic waves. Claim 1 reads:


1. A method for detecting an electromagnetic wave, the method comprising:

providing an electromagnetic wave sensor comprising a carbon nanotube structure, the carbon nanotube structure comprising a plurality of carbon nanotubes arranged substantially along a same direction;

irradiating the carbon nanotube structure with an electromagnetic wave to be measured; and

measuring a variation of a resistance of the carbon nanotube structure when the carbon nanotube structure is irradiated by the electromagnetic wave.