We performed terahertz near-field experiments on single rectangular holes with various lengths grown on an electro-optic crystal substrate with λ/100 resolution. We find that the near-field amplitude becomes proportionally larger as the rectangle becomes narrower, strongly suggesting that a constant energy passes through even for a very narrow slit. The occurrence of a large field enhancement at the fundamental localized resonance is discussed confirming the funneling of energy at the near-field.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics