Nanophotonics

Nanophotonics

Heterogeneous Optical Metastructures

Materials challenge for metastructures at visible ranges.

  • High-refractive-index and low-loss materials needed
  • No such material at visible range due to the general trend of high index, low energy bandgap or low-index, high bandgap

We solved this by using heterogeneous materials.

  • High-index, high-loss materials + low-index, low-loss material
  • Optical modes do not overlap with the high-loss materials
  • Reflection bandwidth of >90% reflectivity increased x10.

Yao, Y., Wu, W. (2017), “All-Dielectric Heterogeneous Metasurface as an Efficient Ultra-Broadband Reflector” Advanced Optical Materials. DOI: 10.1002/adom. 201700090.

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