Stookey S D, Araujo R J
Appl Opt. 1968 May 1;7(5):777-9. doi: 10.1364/AO.7.000777.
Polarizing glasses were made by stretching glass containing colloidal silver. The position of the absorption bands depends strongly on the elongation. This dependence seems to be consistent with the predictions of the theory of light absorption by small metal particles based on a free electron model.