An order of magnitude increase in the quantum efficiency of (Al)GaAs nanowires using hybrid photonic-plasmonic modes

Sudha Mokkapati, Dhruv Saxena, Nian Jiang, Li Li, Hark Hoe Tan, Chennupati Jagadish

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17 Citations (Scopus)

Abstract

We demonstrate 900% relative enhancement in the quantum efficiency (QE) of surface passivated GaAs nanowires by coupling them to resonant nanocavities that support hybrid photonic-plasmonic modes. This nonconventional approach to increase the QE of GaAs nanowires results in QE enhancement over the entire nanowire volume and is not limited to the near-field of the plasmonic structure. Our cavity design enables spatially and spectrally tunable resonant modes and efficient in- and out-coupling of light from the nanowires. Futhermore, this approach is not fabrication intensive; it is scalable and can be adapted to enhance the QE of a wide range of low QE semiconductor nanostructures.

Original languageEnglish
Pages (from-to)307-312
Number of pages6
JournalNano Letters
Volume15
Issue number1
DOIs
Publication statusPublished - 14 Jan 2015
Externally publishedYes

Keywords

  • GaAs
  • nanowire
  • Purcell factor
  • quantum efficiency
  • radiative redombination rate
  • surface passivation

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