An optical antenna collects, modifies and emits energy at light
wavelengths. Linear conductors sized to correspond to the light
wavelengths are used. Nonlinear junctions of small dimension are used to
rectify an alternating waveform induced upon the conductors by the
lightwave electromagnetic energy. The optical antenna and junctions are
effective to produce harmonic energy at light wavelengths. The linear
conductors may be comprised of carbon nanotubes that are attached to a
substrate material, which may then be connected to an electrical port.