Open AccessTerahertz transmission properties of an individual slit in a thin metallic plate
Author(s) -
J. W. Lee,
T. H. Park,
Peter Nordlander,
Daniel M. Mittleman
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.012660
Subject(s) - terahertz radiation , optics , extraordinary optical transmission , transmission (telecommunications) , terahertz gap , electromagnetic radiation , slit , terahertz spectroscopy and technology , materials science , transmission coefficient , metamaterial , diffraction , range (aeronautics) , physics , optoelectronics , surface plasmon , surface plasmon polariton , terahertz metamaterials , plasmon , telecommunications , laser , far infrared laser , composite material , computer science
We report on the terahertz transmission properties through a single slit in a thin metallic film. The properties are studied by comparing the transmissions of TE- and TM-polarized electromagnetic waves over a broad spectral range from the geometrical regime to the subwavelength limit. In the geometrical regime, the remarkable terahertz transmission due to guided modes is observed even without the contribution of surface waves. Whereas in the subwavelength limit, the surface charge oscillations associated with the TM-polarized guided mode give rise to strong transmission enhancement. The nature of the mechanisms for the terahertz transmission is elucidated using theoretical simulations of the near-field distributions and electromagnetic energy flow.