Nonlocal response in plasmonic waveguiding with extreme light confinement

Giuseppe Toscano, Søren Raza, Wei Yan, Claus Jeppesen, Sanshui Xiao, Martijn Wubs, Antti-Pekka Jauho, Sergey I. Bozhevolnyi, N. Asger Mortensen

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Abstract

We present a novel wave equation for linearized plasmonic response, obtained by combining the coupled real-space differential equations for the electric field and current density. Nonlocal dynamics are fully accounted for, and the formulation is very well suited for numerical implementation, allowing us to study waveguides with subnanometer cross-sections exhibiting extreme light confinement. We show that groove and wedge waveguides have a fundamental lower limit in their mode confinement, only captured by the nonlocal theory. The limitation translates into an upper limit for the corresponding Purcell factors, and thus has important implications for quantum plasmonics.
Original languageEnglish
JournalNanophotonics
Volume2
Issue number3
Pages (from-to)161-166
ISSN2192-8606
DOIs
Publication statusPublished - 2013

Bibliographical note

The final publication is available at www.degruyter.com.

Keywords

  • Nanoplasmonics
  • Nonlocal response
  • Light confinement
  • Waveguides
  • Light-matter interactions

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