Chemically Tailored Dielectric-to-Metal Transition for the Design of Metamaterials from Nanoimprinted Colloidal Nanocrystals

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• 作者：Aaron T. Fafarman ; Sung-Hoon Hong ; Humeyra Caglayan ; Xingchen Ye ; Benjamin T. Diroll ; Taejong Paik ; Nader Engheta ; Christopher B. Murray ; Cherie R. Kagan
• 刊名：Nano Letters
• 出版年：2013
• 出版时间：February 13, 2013
• 年：2013
• 卷：13
• 期：2
• 页码：350-357
• 全文大小：474K
• 年卷期：v.13,no.2(February 13, 2013)
• ISSN：1530-6992

文摘

We demonstrate optical metamaterial design using colloidal gold nanocrystal building blocks. In the solid state, chemically exchanging the nanocrystals鈥?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.

Keywords:

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