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Opt Express. 2008 Dec 8;16(25):20484-9.

Near field imaging of terahertz focusing onto rectangular apertures.

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Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.


We performed terahertz near-field experiments on single rectangular holes with various lengths grown on an electro-optic crystal substrate with lambda/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.

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