Chemically tailored dielectric-to-metal transition for the design of metamaterials from nanoimprinted colloidal nanocrystals

Aaron T. Fafarman, Sung Hoon Hong, Humeyra Caglayan, Xingchen Ye, Benjamin T. Diroll, Taejong Paik, Nader Engheta, Christopher B. Murray, Cherie R. Kagan

Research output: Contribution to journalArticleScientificpeer-review

66 Citations (Scopus)

Abstract

We demonstrate optical metamaterial design using colloidal gold nanocrystal building blocks. In the solid state, chemically exchanging the nanocrystals' surface-capping molecules provides a tailorable dielectric-to-metal transition exhibiting a 1010 range in DC conductivity and dielectric permittivity ranging from everywhere positive to everywhere negative throughout the visible-to-near-IR. Direct, wide-area nanoimprinting of subwavelength superstructures at room temperature, on plastic and glass substrates, affords plasmonic resonances ranging from 660 to 1070 nm, in agreement with numerical simulations.

Original languageEnglish
Pages (from-to)350-357
Number of pages8
JournalNano Letters
Volume13
Issue number2
DOIs
Publication statusPublished - 13 Feb 2013
Externally publishedYes
Publication typeA1 Journal article-refereed

Keywords

  • ammonium thiocyanate
  • dielectric function
  • gold nanoparticles
  • ligand exchange
  • Plasmonics
  • soft lithography

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering

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