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Transmission Properties of Surface Plasmon Polaritons Based on Carbon Nanotubes Film

We have numerically evaluated enhanced transmission characteristics at terahertz region by means of a bulls-eyes structure with periodic grooves based on effective carbon nanotube film using the finite integration technique. We investigated the effect of the number of grooves, groove width, groove depth, and the conductivity of material on the enhanced transmission of terahertz waves. By placing the grooves at the near field of the aperture, strongly localized electromagnetic fields are effectively coupled to the aperture with a radius that is 200 times smaller than the resonance wavelength. We demonstrated that 2.4 fold enhancement factor could be obtained with a subwavelength bull-eyes surrounded by three concentric periodic grooves. Our results show that the high transmission from an aperture with grooves is assisted by coupling to the surface plasmons.