Researchers at ETH Zurich have developed an ultrathin, gold-based transparent ... Poulikakos D: Transparent Sunlight-Activated Antifogging Metamaterials. Nature Nanotechnology 2022, doi: external page ...

This makes a one-way window that is matte – it looks opaque, reflecting barely 1 per cent of light from the outside – but still transparent ... such as gold, and materials like silicon ...