title: Near field imaging of terahertz focusing onto rectangular apertures.
abstract: 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.
authors.affiliation: Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
authors.forename: M A
authors.initials: MA
authors.lastname: Seo
authors.forename: A J L
authors.initials: AJ
authors.lastname: Adam
authors.forename: J H
authors.initials: JH
authors.lastname: Kang
authors.forename: J W
authors.initials: JW
authors.lastname: Lee
authors.forename: K J
authors.initials: KJ
authors.lastname: Ahn
authors.forename: Q H
authors.initials: QH
authors.lastname: Park
authors.forename: P C M
authors.initials: PC
authors.lastname: Planken
authors.forename: D S
authors.initials: DS
authors.lastname: Kim
mesh_terms: D008853:Microscopy / Q000379:methods*; D012031:Refractometry / Q000379:methods*; D055053:Terahertz Radiation; D055068:Terahertz Spectroscopy / Q000379:methods*