Interesting. This phys.org article is authored "by Singapore University of Technology and Design"

So they take paid PR directly now? I guess it's better economics than paying a person to rewrite a low-quality summary and not as bad as an AI summarizing the original PR...

This is just photonic crystals, literally the entire point of photonic crystals is to create as many interfaces as possible to give light a second/third/fourth/… chance of getting reflected. Basically why your sunglasses are shiny.

The main news is using a precursor chemical and photolithography to cure hollow glass trusses, so that the interface is glass-against-vacuum instead of glass-against-less-contrasting-material.