Large Transient Optical Modulation of Epsilon-Near-Zero Colloidal Nanocrystals

Benjamin T. Diroll, Peijun Guo, Robert P.H. Chang, Richard D. Schaller

Research output: Contribution to journalArticle

32 Citations (Scopus)


Epsilon-near-zero materials may be synthesized as colloidal nanocrystals which display large magnitude subpicosecond switching of infrared localized surface plasmon resonances. Such nanocrystals offer a solution-processable, scalable source of tunable metamaterials compatible with arbitrary substrates. Under intraband excitation, these nanocrystals display a red-shift of the plasmon feature arising from the low electron heat capacities and conduction band nonparabolicity of the oxide. Under interband pumping, they show in an ultrafast blueshift of the plasmon resonance due to transient increases in the carrier density. Combined with their high-quality factor, large changes in relative transmittance (+86%) and index of refraction (+85%) at modest control fluences (<5 mJ/cm2) suggest that these materials offer great promise for all-optical switching, wavefront engineering, and beam steering operating at terahertz switching frequencies.

Original languageEnglish
Pages (from-to)10099-10105
Number of pages7
JournalACS nano
Issue number11
Publication statusPublished - Nov 22 2016


  • doping
  • epsilon-near-zero
  • localized surface plasmon resonance
  • nanocrystals
  • ultrafast

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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