Plasmonic Horizon in Gold Nanosponges

Cynthia Vidal, Dmitry Sivun, Johannes Ziegler, Dong Wang, Peter Schaaf, Calin Hrelescu, Thomas A. Klar

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

An electromagnetic wave impinging on a gold nanosponge coherently excites many electromagnetic hot-spots inside the nanosponge, yielding a polarization-dependent scattering spectrum. In contrast, a hole, recombining with an electron, can locally excite plasmonic hot-spots only within a horizon given by the lifetime of localized plasmons and the speed carrying the information that a plasmon has been created. This horizon is about 57 nm, decreasing with increasing size of the nanosponge. Consequently, photoluminescence from large gold nanosponges appears unpolarized.

Original languageEnglish
Pages (from-to)1269-1273
Number of pages5
JournalNano Letters
Volume18
Issue number2
DOIs
Publication statusPublished - 14 Feb 2018
Externally publishedYes

Keywords

  • dark-field scattering
  • event horizon
  • fluorescence
  • nanosponges
  • Plasmonics
  • single particle spectroscopy

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