Wide-Angle Spectrally Selective Absorbers and Thermal Emitters Based on Inverse Opals

  title={Wide-Angle Spectrally Selective Absorbers and Thermal Emitters Based on Inverse Opals},
  author={Alireza Shahsafi and Graham Joe and S{\"o}ren Brandt and Anna V. Shneidman and Nicholas Stanisic and Yuzhe Xiao and Raymond A. Wambold and Zhaoning Yu and Jad Salman and Joanna Aizenberg and Mikhail A. Kats},
  journal={ACS Photonics},
Engineered optical absorbers are of substantial interest for applications ranging from stray light reduction to energy conversion. We demonstrate a large-area (centimeter-scale) metamaterial that features near-unity frequency-selective absorption in the mid-infrared wavelength range. The metamaterial comprises a self-assembled porous structure known as an inverse opal, here made of silica. The structure's large volume fraction of voids, together with the vibrational resonances of silica in the… 

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