Open AccessResonantly enhanced transmission of terahertz radiation through a periodic array of subwavelength apertures
Author(s) -
Hua Cao,
Ajay Nahata
Publication year - 2004
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.12.001004
Subject(s) - optics , terahertz radiation , transmission coefficient , aperture (computer memory) , wavelength , amplitude , resonance (particle physics) , radiation , transmission (telecommunications) , extraordinary optical transmission , physics , terahertz spectroscopy and technology , materials science , attenuation coefficient , surface plasmon , surface plasmon polariton , plasmon , atomic physics , electrical engineering , acoustics , engineering
We demonstrate resonantly enhanced transmission of freely propagating coherent terahertz radiation through free-standing metal foils perforated with periodic arrays of sub-wavelength apertures. These arrays consist of 400 microm diameter apertures periodically spaced by 1 mm and 600 microm diameter apertures periodically spaced by 1.5 mm. We measure absolute amplitude transmission coefficients of ~0.6 at the resonance wavelength. Correspondingly, the ratio of the absolute amplitude transmission coefficient to the fractional aperture area at these resonance frequencies is ~5. This value at terahertz frequencies is significantly larger than equivalent values measured at optical frequencies.