Multi-photon polymerization is a suitable technology for meta-material fabrication. Metamaterials are composites whose physical properties are different from those of the materials they are made from.
The 3D gyroid structure is mechanically rigid, but light. The structure is fabricated by using the widened objective working (WOW) distance approach, with which the working distance of the high numerical aperture objective can be increased. The overall size of this structure – is 1 mm × 1 mm × 1 mm. The structure height is much greater than the working distance of the objective used (0.19 mm). This microfabrication technique makes it possible to fabricate mesoscale structures – structures whose total size is a few orders larger than their finest feature.