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Keywords:

  • Germanium;
  • Photonic crystals;
  • Template-directed assembly
Thumbnail image of graphical abstract

A germanium inverse woodpile structure exhibiting a 25% wide photonic band gap (PBG) is created by direct-write assembly of a polymeric template (see figure and cover) followed by sequential deposition of a sacrificial oxide bilayer and germanium. Upon removal of the template and sacrificial layers, the reflectance spectrum shows a large peak in the mid-IR region, indicative of a PBG considerably larger than those shown by conventional woodpile structures.