Dephasing of electromagnetic fields in scattering from an isolated slit in a gold film

Jeffrey M. McMahon, Stephen K. Gray, George C. Schatz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Herein we perform three-dimensional finite-difference time-domain calculations on an isolated micron size slit in a thin gold film to study the behavior of confined electromagnetic fields for TM, TE, and circular incident polarizations. It is found that the electric and magnetic fields exhibit well defined standing wave patterns inside the slit. Moreover, the electric and magnetic fields are seen to be out of phase, and the power flow through the slit is governed mainly by the magnetic field for TM polarization and the electric field for TE and circular polarizations. To understand these results a theoretical modal expansion of the fields in the presence of the slit is done. It is found that the standing wave patterns and dephasing can be attributed to a superposition of propagating and evanescent waveguide modes.

Original languageEnglish
Title of host publicationPlasmonics
Subtitle of host publicationNanoimaging, Nanofabrication, and Their Applications IV
DOIs
Publication statusPublished - Nov 21 2008
EventPlasmonics: Nanoimaging, Nanofabrication, and Their Applications IV - San Diego, CA, United States
Duration: Aug 10 2008Aug 14 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7033
ISSN (Print)0277-786X

Other

OtherPlasmonics: Nanoimaging, Nanofabrication, and Their Applications IV
CountryUnited States
CitySan Diego, CA
Period8/10/088/14/08

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Keywords

  • Dephasing
  • Electromagnetic fields
  • FDTD
  • Metal slits
  • Modal method
  • Waveguide modes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

McMahon, J. M., Gray, S. K., & Schatz, G. C. (2008). Dephasing of electromagnetic fields in scattering from an isolated slit in a gold film. In Plasmonics: Nanoimaging, Nanofabrication, and Their Applications IV [703311] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7033). https://doi.org/10.1117/12.790647