Journal
OPTICS EXPRESS
Volume 21, Issue 25, Pages 30724-30730Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.030724
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Funding
- National Natural Science Foundation of China [61036006, 61275104]
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In this paper, we theoretically and experimentally demonstrate broadband metamaterial absorbers that work in the mid-infrared regime. In the absorbers, two or four gold cross resonators with different sizes are multiplexed in a unit cell on SiO2 spacing layer on top of gold ground plane. Compared with the single cross resonator absorbers with a Q factor of 6.39, the developed absorber with two cross resonators multiplexed reduces the Q factor to 3.78. When four different cross resonators are integrated, the Q factor drops to as low as 1.85, and the bandwidth almost covers the full mid-infrared regime from 3 mu m to 5 mu m with absorbance higher than 50%. (C) 2013 Optical Society of America
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