Electrical tuning of a quantum plasmonic resonance

Xiaoge Liu, Ju Hyung Kang, Hongtao Yuan, Junghyun Park, Soo Jin Kim, Yi Cui, Harold Y. Hwang, Mark L. Brongersma

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Surface plasmon (SP) excitations in metals facilitate confinement of light into deep-subwavelength volumes and can induce strong light-matter interaction. Generally, the SP resonances supported by noble metal nanostructures are explained well by classical models, at least until the nanostructure size is decreased to a few nanometres, approaching the Fermi wavelength F of the electrons. Although there is a long history of reports on quantum size effects in the plasmonic response of nanometre-sized metal particles, systematic experimental studies have been hindered by inhomogeneous broadening in ensemble measurements, as well as imperfect control over size, shape, faceting, surface reconstructions, contamination, charging effects and surface roughness in single-particle measurements. In particular, observation of the quantum size effect in metallic films and its tuning with thickness has been challenging as they only confine carriers in one direction. Here, we show active tuning of quantum size effects in SP resonances supported by a 20-nm-thick metallic film of indium tin oxide (ITO), a plasmonic material serving as a low-carrier-density Drude metal. An ionic liquid (IL) is used to electrically gate and partially deplete the ITO layer. The experiment shows a controllable and reversible blue-shift in the SP resonance above a critical voltage. A quantum-mechanical model including the quantum size effect reproduces the experimental results, whereas a classical model only predicts a red shift.

Original languageEnglish
Pages (from-to)866-870
Number of pages5
JournalNature Nanotechnology
Volume12
Issue number9
DOIs
Publication statusPublished - 2017 Sep 1
Externally publishedYes

Fingerprint

Surface plasmon resonance
Surface Plasmon Resonance
Metallic films
Tuning
Metals
tuning
Tin oxides
Indium
Nanostructures
surface plasmon resonance
Ionic Liquids
Surface reconstruction
Precious metals
Ionic liquids
Light
Thick films
indium oxides
tin oxides
Carrier concentration
Contamination

ASJC Scopus subject areas

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

Cite this

Liu, X., Kang, J. H., Yuan, H., Park, J., Kim, S. J., Cui, Y., ... Brongersma, M. L. (2017). Electrical tuning of a quantum plasmonic resonance. Nature Nanotechnology, 12(9), 866-870. https://doi.org/10.1038/nnano.2017.103

Electrical tuning of a quantum plasmonic resonance. / Liu, Xiaoge; Kang, Ju Hyung; Yuan, Hongtao; Park, Junghyun; Kim, Soo Jin; Cui, Yi; Hwang, Harold Y.; Brongersma, Mark L.

In: Nature Nanotechnology, Vol. 12, No. 9, 01.09.2017, p. 866-870.

Research output: Contribution to journalArticle

Liu, X, Kang, JH, Yuan, H, Park, J, Kim, SJ, Cui, Y, Hwang, HY & Brongersma, ML 2017, 'Electrical tuning of a quantum plasmonic resonance', Nature Nanotechnology, vol. 12, no. 9, pp. 866-870. https://doi.org/10.1038/nnano.2017.103
Liu, Xiaoge ; Kang, Ju Hyung ; Yuan, Hongtao ; Park, Junghyun ; Kim, Soo Jin ; Cui, Yi ; Hwang, Harold Y. ; Brongersma, Mark L. / Electrical tuning of a quantum plasmonic resonance. In: Nature Nanotechnology. 2017 ; Vol. 12, No. 9. pp. 866-870.
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