Inhomogeneous Surface Plasmon Polaritons

Jonathan J. Foley, Jeffrey M. McMahon, George C Schatz, Hayk Harutyunyan, Gary P. Wiederrecht, Stephen K. Gray

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We show analytically and with rigorous computational electrodynamics how inhomogeneous surface plasmon polaritons (ISPPs) can be generated by refraction of ordinary SPPs at metal-metal interfaces. ISPPs, in contrast with SPPs, propagate and decay in different directions and can therefore exhibit significantly different intensity patterns. Our analytical arguments are based on a complex generalization of Snell's law to describe how SPPs moving on one metal surface are refracted at an interface with a second, different metal surface. The refracted waveform on the second metal is an ISPP. Under suitable circumstances the decay of an ISPP can be almost perpendicular to the propagation direction, leading to significant confinement. It is also found that ISPPs on the second metal can retain information about the SPPs on the first metal, a phenomenon that we term "dispersion imprinting". The complex Snell's law predictions are validated with 3-D finite-difference time-domain simulations, and possible means of experimentally observing ISPPs are suggested. The idea of ISPPs and how they result from refraction may expand the potential for designing the propagation and dispersion features of surface waves in general, including surface phonon polaritons, surface magnons, and guided waves in metamaterials. (Figure Presented).

Original languageEnglish
Pages (from-to)739-745
Number of pages7
JournalACS Photonics
Volume1
Issue number8
DOIs
Publication statusPublished - Aug 20 2014

Fingerprint

polaritons
Metals
metals
Phonons
Refraction
metal surfaces
refraction
Surface waves
propagation
decay
Guided electromagnetic wave propagation
Electrodynamics
Metamaterials
electrodynamics
magnons
surface waves
Wave propagation
waveforms
predictions

Keywords

  • Dispersion engineering
  • Inhomogeneous waves
  • Near-field optics
  • Plasmonics
  • Refraction
  • Surface waves

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Biotechnology
  • Electrical and Electronic Engineering

Cite this

Foley, J. J., McMahon, J. M., Schatz, G. C., Harutyunyan, H., Wiederrecht, G. P., & Gray, S. K. (2014). Inhomogeneous Surface Plasmon Polaritons. ACS Photonics, 1(8), 739-745. https://doi.org/10.1021/ph500172f

Inhomogeneous Surface Plasmon Polaritons. / Foley, Jonathan J.; McMahon, Jeffrey M.; Schatz, George C; Harutyunyan, Hayk; Wiederrecht, Gary P.; Gray, Stephen K.

In: ACS Photonics, Vol. 1, No. 8, 20.08.2014, p. 739-745.

Research output: Contribution to journalArticle

Foley, JJ, McMahon, JM, Schatz, GC, Harutyunyan, H, Wiederrecht, GP & Gray, SK 2014, 'Inhomogeneous Surface Plasmon Polaritons', ACS Photonics, vol. 1, no. 8, pp. 739-745. https://doi.org/10.1021/ph500172f
Foley JJ, McMahon JM, Schatz GC, Harutyunyan H, Wiederrecht GP, Gray SK. Inhomogeneous Surface Plasmon Polaritons. ACS Photonics. 2014 Aug 20;1(8):739-745. https://doi.org/10.1021/ph500172f
Foley, Jonathan J. ; McMahon, Jeffrey M. ; Schatz, George C ; Harutyunyan, Hayk ; Wiederrecht, Gary P. ; Gray, Stephen K. / Inhomogeneous Surface Plasmon Polaritons. In: ACS Photonics. 2014 ; Vol. 1, No. 8. pp. 739-745.
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