Quadrupole-enhanced raman scattering

Simon P. Hastings, Pattanawit Swanglap, Zhaoxia Qian, Ying Fang, So Jung Park, Stephan Link, Nader Engheta, Zahra Fakhraai

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


Dark, nonradiating plasmonic modes are important in the Raman enhancement efficiency of nanostructures. However, it is challenging to engineer such hotspots with predictable enhancement efficiency through synthesis routes. Here, we demonstrate that spiky nanoshells have designable quadrupole resonances that efficiently enhance Raman scattering with unprecedented reproducibility on the single particle level. The efficiency and reproducibility of Quadrupole Enhanced Raman Scattering (QERS) is due to their heterogeneous structure, which broadens the quadrupole resonance both spatially and spectrally. This spectral breadth allows for simultaneous enhancement of both the excitation and Stokes frequencies. The quadrupole resonance can be tuned by simple modifications of the nanoshell geometry. The combination of tunability, high efficiency, and reproducibility makes these nanoshells an excellent candidate for applications such as biosensing, nanoantennaes, and photovoltaics.

Original languageEnglish
Pages (from-to)9025-9034
Number of pages10
JournalACS Nano
Issue number9
StatePublished - 23 Sep 2014

Bibliographical note

Publisher Copyright:
© 2014 American Chemical Society.


  • QERS
  • Raman spectroscopy
  • SERS
  • plasmon resonance
  • quadrupole resonance
  • spiky nanoshells


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