Abstract
A Bull's eye (BE) plasmonic structure exhibits a powerful property of highly enhanced light transmission through a sub-wavelength aperture. However, the BE structure in the terahertz (THz) region exhibits the problems of a relatively low THz-field enhancement factor and a large area with an increasing groove number. Here, we report on a design of a THz BE structure that utilizes a solid immersion method based on the high refractive index of a silicon (Si) material. By fabricating a deep-etched Si template covered with a gold film, we achieved a greatly enhanced THz transmission with an enhancement factor of up to ∼108 and also miniaturized the structure size by the factor of 11. These features demonstrate that the BE performance can be further improved by engineering dielectric materials.
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