A Nanotube diameter versus emitting wavelength

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Can somebody please help me I am looking for the diameter required of a carbon nanotube to emit a wavelength of 800 nm. If I could just find a graph of nanotube diameter versus emitting wavelength.
 
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tech99 said:
There seem to be several modes for nanotube radiation. I found a useful reference as follows:-
https://Newton.ex.ac.uk/research/qsystems/portnoi/HandbookNanophys_proofs_pubs_data.pdf
One of the modes of nano tube radiation seems to depend on length, just as for a metal rod, but there are others to study.
Thanks do you have a chapter on what range of wavelengths such a set of modes will absorb?
 

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