Electromagnetic waves traveling through a mesh

[Northprairieman]

You know how a microwave oven has a mesh on the door so visible light gets through but not the microwaves? Can such a thing be done with infrared radiation too? Is it possible to block heat from getting through a mesh but not visible light?

 

[Dr_Morbius]

There are lots of materials that block infrared but allow light through. The mesh works because it acts like a Faraday cage. It would be impossible to make a mesh that fine.

http://en.wikipedia.org/wiki/Infrared_cut-off_filter
http://en.wikipedia.org/wiki/Faraday_cage