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We report on a technique for tuning a resonant frequency and enhancing transmission of a bull's eye (BE) plasmonic antenna by forming dielectric materials on a sub-wavelength aperture. We observed that the use of the dielectric material shifted the peak frequency of terahertz (THz) transmission through the aperture and also enhanced the transmittance. These results indicate the usefulness of dielectric...
A conventional bull's eye antenna has a great potential to terahertz technologies, while its narrow band nature limits its ability for multi-frequency applications. Here we proposed an split-joint bull's eye (SJBE) structure with optimized aperture, which can achieve multi-frequency transmission and high concentration.
We report on a thickness dependence of the terahertz (THz) bull's eye antenna that uses surface plasmon. For the optimization of the device structure and the strong THz field enhancement, we investigate the thickness dependence of substrate for optimization. We achieved a high THz transmission through a sub-wavelength aperture and observed that the main peak has a weak dependence but the side peaks...
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