Colossal Terahertz Field Enhancement in Slant Nano-Antennas

Metallic nanostructures have important roles in electromagnetic field manipulations due to the localization of electromagnetic waves, for which fabrication techniques in nanotechnology have been developed. To achieve higher field enhancement, it is required to decrease the dimensions of the nanostructures such as thickness or width of the gap. Here, we fabricated the slant nano-antennas where a portion of metals on each side is overlapped. The slant nano-antennas realize higher electromagnetic field enhancement while keeping background noise almost zero.