Title :
Terahertz transmission through nanogaps using both pulsed and CW sources
Author :
Kyoung, J.S. ; Seo, M.A. ; Park, H.R. ; Kwon, O. ; Park, G.S. ; Suwal, O.K. ; Choi, S.S. ; Kim, D.S.
Author_Institution :
Dept. of Phys. & Astron., Seoul Nat. Univ., Seoul, South Korea
Abstract :
We measure field enhancement through nanogap by using both terahertz time domain spectroscopy (TDS) and terahertz imaging technique with continuous wave (CW) radiation source. Far-field amplitude is connected to the near-field enhancement through the Kirchhoff formalism. With TDS, we found that a field enhancement of 200 at 0.1 THz for the 500 nm slit. To confirm our TDS results, we also perform the transmission experiment with 70 nm width nanogap structure perforated in thin gold films on Si substrates by using 0.2 THz CW source.
Keywords :
gold; metallic thin films; nanostructured materials; terahertz wave imaging; terahertz wave spectra; Au; Kirchhoff formalism; Si; Si substrates; continuous wave source; far-field amplitude; field enhancement; frequency 0.1 THz; frequency 0.2 THz; nanogaps; near-field enhancement; pulsed source; radiation source; size 500 nm; terahertz imaging; terahertz time domain spectroscopy; terahertz transmission; thin gold films; Apertures; Detectors; Extraterrestrial measurements; Gold; Optical films; Optical pulses; Optical scattering; Physics; Pulse measurements; Spectroscopy;
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.2009.5324712
