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We have proposed a metal disc-shaped terahertz surface wave splitter with a center hole and radially placed gratings. Unfortunately, appreciable reflected waves have been observed from the input port of the center hole. To reduce the reflected waves, we insert a metal rod with a tapered end into the center hole of the disc-shaped splitter operating at two frequencies. It is found that the reflected...
This article presents several topics regarding the FDTD analysis of terahertz (THz) devices. First, the treatment of metal is discussed with attention to the use of the perfect electric conductor approximation and the Drude model that takes metal dispersion into account. Next, two ways to support THz waves are explained on the basis of the propagation characteristics of surface plasmon polaritons...
Optical nanodipole antennas using surface plasmon polaritons are numerically investigated with the three-dimensional finite-difference time-domain method. The length of the dipole arm is determined using the effective index of the metal rod calculated from the eigenmode analysis. A stub structure is introduced to match the impedance between the nanodipole antenna and the feeding wave-guide. The radiation...
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