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Neal-Ideal Optical Metamaterial Absorbers with Super-Octave Bandwidth


Metamaterial schematic, electron micrograph, and spectrumNanostructured
optical coatings with tailored spectral absorption properties are of interest
for a wide range of applications such as spectroscopy, emissivity control, and
solar energy harvesting.  MRSEC
researchers have designed and demonstrated a broadband,
polarization-insensitive metamaterial with greater than 98% measured average
absorptivity that is maintained over a wide ±45
field-of-view for mid-infrared wavelengths between 1.77 and 4.81 µm.
a significant step toward realizing practical optical metamaterial absorbers
that provide near-perfect broadband absorption over a specified super-octave