There is at least one common material – SiC (it may be unique) which can be 
fabricated to convert blackbody to quasi monochromatic IR.

 

There are a number of papers about this, but the first one that pops up is 
“Extraordinary Coherent Thermal Emission From SiC Due to Coupled Resonant 
Cavities” Nev, et al

 

From: Eric Walker 

 

Stephen A. Lawrence wrote:

 

The idea seems to be that you put a collector made of nanotubes and 
nanophotonic crystals in front of the cell and it "transforms" the incoming 
sunlight from a mishmosh of frequencies into a nearly monochromatic beam, whose 
frequency is centered on the band the cell can convert.

 

This sounds like a blackbody-to-monochromatic light converter. Will physical 
principles allow such a thing without expenditure of energy?

 

Eric

 

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