期刊
OPTICS EXPRESS
卷 22, 期 12, 页码 15104-15110出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.22.015104
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- DRDO, India [DECS/15/15124/D(RD)/CARS-1]
- CSIR, India
Metamaterials that have broadband absorption at MIR frequencies, and yet, are transmitive at visible frequencies are fabricated using a semi-conducting Indium Tin Oxide (ITO) film as ground plane. The metamaterial absorber consists of an array of uniform aluminum disks separated by a Zinc Sulphide (ZnS) dielectric spacer layer from the ITO ground plane. The metamaterial was fabricated by a simple, cost-effective vapor deposition through a shadow mask. Compared with the usual metal/dielectric/metal tri-layer absorbers, the metal/dielectric/ITO absorber shows a peak absorbance of 98% and >70% over the mid-infrared regime from 4 to 7 mu m. The broadband nature arises due to smaller dispersion in the dielectric permittivity of ITO compared to that of plasmonic metals at mid-infrared frequencies. (C) 2014 Optical Society of America
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