Title :
Terahertz near-field accumulation assisted by shape resonance in narrow rectangular apertures on metal film
Author :
Park, D.J. ; Choi, S.B. ; Ahn, Y.H. ; Sohn, I.B. ; Kang, C. ; Jeong, M.S. ; Kim, D.S.
Author_Institution :
Dept. of Phys. & Astron., Seoul Nat. Univ., Seoul, South Korea
Abstract :
We report huge field accumulations in rectangular aperture arrays on thin metal film by using shape resonance in THz frequency region. A large far-field transmittance enhancement is observed in the samples of various widths ranging from 10 mum to 1.8 mum which corresponds to only an order of lambda/100. Theoretical calculations based on vector diffraction theory indicates 230 times field enhancement in the near-field for the 1.8 mum rectangular aperture.
Keywords :
electromagnetic wave diffraction; metallic thin films; terahertz wave spectra; THz time-domain spectroscopy; far-field transmittance enhancement; field enhancement; narrow rectangular apertures; rectangular aperture arrays; shape resonance; size 10 mum to 1.8 mum; terahertz near-field accumulation; thin metal film; vector diffraction theory; Aluminum; Apertures; Astronomy; Frequency; Optical films; Optical recording; Photonics; Physics; Resonance; Shape;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on
Conference_Location :
Busan
Print_ISBN :
978-1-4244-5416-7
Electronic_ISBN :
978-1-4244-5417-4
DOI :
10.1109/ICIMW.2009.5325593
