Abstract
We computationally study periodic impedance-matched metal-dielectric metamaterials and the advantage of imprinting moth-eye surfaces on them. Impedance-matched metamaterials are known to act as strong, polarization-independent, broadband absorbers. However, in the infrared region far from the metal's plasma frequency, the reflection from metal layers dominates over the absorption. Using anti-reflective moth-eye surfaces we show that it is possible to obtain absorption independent of polarization or incidence angle, over an exceptionally broad frequency range from 400 nm to 6 μm.
Highlights
Research in electromagnetic absorbers has a long history, dating back to the Salisbury absorber in 1952 [1]
The development of negative refractive index metamaterials was a breakthrough in this technology
Negative index materials were first conceived by Vesalago in 1968 [2], but it was not until the year 2000 that an experimental demonstration was obtained [3]
Summary
Research in electromagnetic absorbers has a long history, dating back to the Salisbury absorber in 1952 [1]. The development of negative refractive index metamaterials was a breakthrough in this technology. Negative index materials were first conceived by Vesalago in 1968 [2], but it was not until the year 2000 that an experimental demonstration was obtained [3]. Subwavelength structures to produce a desired electromagnetic response in materials and devices continues to be a subject of considerable interest. Along with many possible exotic electromagnetic effects, metamaterials can be optimized for perfect absorption. The first such metamaterial absorber was developed in 2008 [4], experimentally achieving 88% absorptance at microwave frequencies
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