US Patent 8009284 - CNT electromagnetic sensor
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.