期刊
OPTICS LETTERS
卷 37, 期 11, 页码 2133-2135出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.37.002133
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资金
- 973 Program of China [2011CB301800]
- National Natural Science Foundation of China [60825405, 61138002, 61177013]
We propose a broadband infrared absorber by engineering the frequency dispersion of metamaterial surface (metasurface) to mimic an ideal absorbing sheet. With a thin layer of structured nichrome, a polarization-independent absorber with absorption larger than 97% is numerically demonstrated over a larger than one octave bandwidth. It is shown that the bandwidth enhancement is related with the transformation of the Drude model of free electron gas in metal film to the Lorentz oscillator model of a bound electron in the structured metallic surface. We believe that the concept of dispersion engineering may provide helpful guidance for the design of a broadband absorber. (c) 2012 Optical Society of America
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