Far field detection of terahertz near field enhancement of sub-wavelength slits using Kirchhoff integral formalism

J. S. Kyoung, M. A. Seo, H. R. Park, K. J. Ahn, D. S. Kim

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

We demonstrate that the near field enhancement of sub-wavelength slits can be experimentally determined in the far field by using a reference aperture. Our simple model derived from the Kirchhoff integral formalism shows that enhancement of the near field at a slit exit with respect to the incident wave can be read in the transmitted amplitude through the slit attached on a reference aperture, normalized by the transmitted amplitude through the reference aperture. Furthermore, the near field enhancement obtained in such a way is essentially independent of the reference aperture size. By performing terahertz time domain spectroscopy we experimentally confirm the inverse frequency dependence of the near field enhancement of extremely narrow slits and measure the maximum field enhancement reaching 200 at 0.1 THz for a 500-nm-width slit.

Original languageEnglish (US)
Pages (from-to)4907-4910
Number of pages4
JournalOptics Communications
Volume283
Issue number24
DOIs
StatePublished - Dec 15 2010
Externally publishedYes

Bibliographical note

Funding Information:
This research was supported by the Korea Science and Engineering Foundation (KOSEF) (SRC, No: R11-2008-095-01000-0 ) and the Korea Research Foundation (KRF) grant funded by the Korea government (MEST) (No: 2009-0071309 ), KICOS (GRL, K20815000003 ), Seoul Science Fellowship and the Seoul R&BD Program ( 10543 ).

Keywords

  • Field enhancement
  • Kirchhoff integral
  • Terahertz

Fingerprint

Dive into the research topics of 'Far field detection of terahertz near field enhancement of sub-wavelength slits using Kirchhoff integral formalism'. Together they form a unique fingerprint.

Cite this