Second Harmonic Spectroscopy of Surface Lattice Resonances

David C. Hooper, Christian Kuppe, Danqing Wang, Weijia Wang, Jun Guan, Teri W. Odom, Ventsislav K. Valev

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Because of their large figures of merit, surface lattice resonances (SLRs) in metal nanoparticle arrays are very promising for chemical and biomolecular sensing in both liquid and gas media. SLRs are sensitive to refractive index changes both near the surface of the nanoparticles (surface sensitivity) and in the volume between them (bulk sensitivity). Because of its intrinsic surface-sensitivity and a power law dependence on electric fields, second harmonic generation (SHG) spectroscopy can improve upon both the surface and volume sensitivities of SLRs. In this report on SHG spectroscopy of plasmonic nanoparticles, we show that the SHG signal is greatly increased (up to 450 times) by the SLRs. We also demonstrate very narrow resonances in SHG intensity (∼5 nm fwhm). We illustrate how the SHG resonances are highly sensitive to SLRs by varying the fundamental wavelength, angle of incidence, nanoparticle material, and lattice constant of the arrays. Finally, we identify an SHG resonance (10 nm fwhm) that is electric dipole forbidden and can be attributed to higher-order multipoles, enhanced by the strong near-fields of SLRs. Our results open up new and very promising avenues for chemical and biomolecular sensing based on SHG spectroscopy of SLRs.

Original languageEnglish
Pages (from-to)165-172
Number of pages8
JournalNano letters
Volume19
Issue number1
DOIs
Publication statusPublished - Jan 9 2019

Keywords

  • Nonlinear optics
  • plasmonics
  • quadrupoles
  • surface lattice resonance

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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  • Cite this

    Hooper, D. C., Kuppe, C., Wang, D., Wang, W., Guan, J., Odom, T. W., & Valev, V. K. (2019). Second Harmonic Spectroscopy of Surface Lattice Resonances. Nano letters, 19(1), 165-172. https://doi.org/10.1021/acs.nanolett.8b03574