Assignment:
The silver particles are now converted to silver sulphide. Estimate the Plasmon frequency of silver sulphide (density of 7300 kgm-3) assuming that it is a free electron-like semiconductor.
Silver sulphide has a band gap of 0.85eV and a further optical transition at 1200nm. Above this energy the dielectric permittivity varies as:
e?1?p2?2
Estimate the absorption energy you would expect for the interface Plasmon energy of silver sulphide embedded in PMMA.