Light-induced thermionic electron emission from arrays of carbon nanotubes is observed using low-power, continuous-wave lasers with a broad set of wavelengths ranging from violet to infrared. The thermionic emission current is highest when the electric field of the laser is parallel to the axis of the nanotubes and lowest when it is perpendicular. The polarization dependence is stronger for the longer-wavelength beam.
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Moghaddam et al. (2012) studied this question.
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