Perfect mirror debuts
Material that reflects light without letting any escape could improve lasers
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2013/07/ag_image2_feat-1.jpg?fit=860%2C460&ssl=1)
A new type of mirror consists of a slab of silicon nitride drilled with tiny holes (illustrated). The holes and the gaps between them are smaller than the wavelength of visible light.
Bo Zhen