Journal
NANO LETTERS
Volume 13, Issue 2, Pages 350-357Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl303161d
Keywords
Plasmonics; soft lithography; gold nanoparticles; ammonium thiocyanate; ligand exchange; dielectric function
Categories
Funding
- Office of Naval Research Multidisciplinary University Research Initiative [ONR-N00014-10-1-0942]
- U.S. Department of Energy Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-SC0002158]
- NSF [DMS-0935165, DMR05-1120901]
- Direct For Mathematical & Physical Scien
- Division Of Mathematical Sciences [0935165] Funding Source: National Science Foundation
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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.
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