Tunable subradiant lattice plasmons by out-of-plane dipolar interactions

Wei Zhou, Teri W Odom

Research output: Contribution to journalArticle

236 Citations (Scopus)

Abstract

Plasmonic nanostructures concentrate optical fields into nanoscale volumes, which is useful for plasmonic nanolasers, surface enhanced Raman spectroscopy and white-light generation. However, the short lifetimes of the emissive plasmons correspond to a rapid depletion of the plasmon energy, preventing further enhancement of local optical fields. Dark (subradiant) plasmons have longer lifetimes, but their resonant wavelengths cannot be tuned over a broad wavelength range without changing the overall geometry of the nanostructures. Also, fabrication of the nanostructures cannot be readily scaled because their complex shapes have subwavelength dimensions. Here, we report a new type of subradiant plasmon with a narrow (∼5 nm) resonant linewidth that can be easily tuned by changing the height of large (>100 nm) gold nanoparticles arranged in a two-dimensional array. At resonance, strong coupling between out-of-plane nanoparticle dipolar moments suppresses radiative decay, trapping light in the plane of the array and strongly localizing optical fields on each nanoparticle. This new mechanism can open up applications for subradiant plasmons because height-controlled nanoparticle arrays can be manufactured over wafer-scale areas on a variety of substrates.

Original languageEnglish
Pages (from-to)423-427
Number of pages5
JournalNature Nanotechnology
Volume6
Issue number7
DOIs
Publication statusPublished - Jul 2011

Fingerprint

Plasmons
plasmons
Crystal lattices
Nanoparticles
Nanostructures
nanoparticles
interactions
life (durability)
Wavelength
wavelengths
Gold
Linewidth
Raman spectroscopy
depletion
trapping
wafers
gold
moments
Fabrication
fabrication

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering
  • Materials Science(all)
  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics

Cite this

Tunable subradiant lattice plasmons by out-of-plane dipolar interactions. / Zhou, Wei; Odom, Teri W.

In: Nature Nanotechnology, Vol. 6, No. 7, 07.2011, p. 423-427.

Research output: Contribution to journalArticle

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