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