Perfect coupling of light to surface plasmons with ultra-narrow linewidths

Maxim Sukharev, P. R. Sievert, T. Seideman, J. B. Ketterson

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We examine the coupling of electromagnetic waves incident normal to a thin silver film that forms an oscillatory grating embedded between two otherwise uniform, semi-infinite half spaces. Two grating structures are considered, in one of which the midpoint of the Ag film remains fixed whereas the thickness varies sinusoidally, while in the other the mid point oscillates sinusoidally whereas the film thickness remains fixed. On reducing the light wavelength from the long wavelength limit, we encounter signatures in the transmission, T, and reflection, R, coefficients associated with: (i) the short-range surface plasmon mode, (ii) the long-range surface plasmon mode, and (iii) electromagnetic diffraction tangent to the grating. The first two features can be regarded as generalized (plasmon) Wood's anomalies whereas the third is the first-order conventional (electromagnetic) Wood's anomaly. The energy density at the film surface is enhanced for wavelengths corresponding to these three anomalies, particularly for the long-range plasmon mode in thin films. When exciting the silver film with a pair of waves incident from opposite directions, we find that by adjusting the grating oscillation amplitude and fixing the relative phase of the incoming waves to be even or odd, T+R can be made to vanish for one or the other of the plasmon modes; this corresponds to perfect coupling (impedance matching in the language of electrical engineering) between the incoming light and these modes.

Original languageEnglish (US)
Article number034708
JournalJournal of Chemical Physics
Volume131
Issue number3
DOIs
StatePublished - 2009

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Plasmons
Electromagnetic Phenomena
plasmons
Silver
Linewidth
Electromagnetic Radiation
Light
gratings
Electric Impedance
Wavelength
anomalies
Wood
Language
silver
wavelengths
Wave transmission
Electrical engineering
electromagnetism
Diffraction gratings
electrical engineering

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry
  • Medicine(all)

Cite this

Perfect coupling of light to surface plasmons with ultra-narrow linewidths. / Sukharev, Maxim; Sievert, P. R.; Seideman, T.; Ketterson, J. B.

In: Journal of Chemical Physics, Vol. 131, No. 3, 034708, 2009.

Research output: Contribution to journalArticle

Sukharev, Maxim ; Sievert, P. R. ; Seideman, T. ; Ketterson, J. B. / Perfect coupling of light to surface plasmons with ultra-narrow linewidths. In: Journal of Chemical Physics. 2009 ; Vol. 131, No. 3.
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