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A gyroid structure is a distinct morphology that is triply periodic andconsists of minimal isosurfaces containing no straight lines. We have designedand synthesized amorphous silicon (a-Si) mid-infrared gyroid photonic crystalsthat exhibit a complete bandgap in infrared spectroscopy measurements. Photoniccrystals were synthesized by deposition of a-Si/Al2O3 coatings onto asacrificial polymer scaffold defined by two-photon lithography. We observed a100% reflectance at 7.5 \mum for single gyroids with a unit cell size of 4.5\mum, in agreement with the photonic bandgap position predicted from full-waveelectromagnetic simulations, whereas the observed reflection peak shifted to 8um for a 5.5 \mum unit cell size. This approach represents asimulation-fabrication-characterization platform to realize three-dimensionalgyroid photonic crystals with well-defined dimensions in real space andtailored properties in momentum space.

Three-dimensional single gyroid photonic crystals with a mid-infrared bandgap