Enhancement factor for electrical near-field on perturbation slit nano structure with peak resonance at 30 THz

This paper presents the investigation carried out on electrical near-field enhancement of a perturbation slit of a rectangular radiating nanostructure. The operating frequency is defined at thermal radiation spectrum from 20 THz to 40 THz. Single and two identical perturbation slits are introduced at the center of the nano structure. It was found that the former is able to enhance the near-field distribution to 120 times while the latter is approximately 80 times. In addition, the splitting of the near-field amplitude resembles that of an energy divider.