Material Reflection: Creating an Optical Filter in Cycles I am very new to Blender and am using it to create images for a new kind of solar energy device.  However, one of the pieces of this device is an optical filter: i.e. it is a square plane that reflects ONLY the red light.  Thus, blue light can pass through.  

My question to the wonderful people on Blender Stack Exchange: is there any way of creating a material that reflects only a small portion of the visible light?  I realize that this is a very niche topic, but any ideas or advice you may have will be much appreciated!

Thanks so much in advance.
Would something like this work?  The Glossy reflects only red and the Transparent Shader allows all the Green/Blue to pass.