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

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

doi:10.1117/12.790647

28 August 2008 Dephasing of electromagnetic fields in scattering from an isolated slit in a gold film

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

Proceedings Volume 7033, Plasmonics: Nanoimaging, Nanofabrication, and Their Applications IV; 703311 (2008) https://doi.org/10.1117/12.790647
Event: NanoScience + Engineering, 2008, San Diego, California, United States

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.

Citation Download Citation

Jeffrey M. McMahon, Stephen K. Gray, and George C. Schatz "Dephasing of electromagnetic fields in scattering from an isolated slit in a gold film", Proc. SPIE 7033, Plasmonics: Nanoimaging, Nanofabrication, and Their Applications IV, 703311 (28 August 2008); https://doi.org/10.1117/12.790647

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