Trapping of surface-plasmon polaritons in a graded Bragg structure: Frequency-dependent spatially separated localization of the visible spectrum modes

Lin Chen, Guo Ping Wang, Qiaoqiang Gan, Filbert J. Bartoli

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

We theoretically demonstrate that a metallic film covered by a dielectric grating of graded thickness can strongly slow light as the propagation velocities of surface plasmon polaritons (SPPs) are reduced over a large frequency bandwidth at visible frequencies. Since the dispersive relation of SPPs is dependent on the dielectric grating thickness, the guided SPPs at different frequencies can be localized at different spatial positions of the plasmonic grating. We numerically demonstrate that a true rainbow from violet to red colors can be separately localized, resulting in the spatial separation of the visible spectrum on a chip. © 2009 The American Physical Society.
Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number16
DOIs
StatePublished - Oct 30 2009
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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