Abstract
For an air/Ag-film(42.0 nm)/prism geometry, we have measured the intensity of the surface-plasmon polariton energy emitted through surface roughness into the air side and then simultaneously evaluated the surface-roughness parameters, i.e., the transverse correlation length \ensuremath{\sigma} and the surface corrugation depth \ensuremath{\delta} for the air/Ag-film interface. The efficiency of conversion of the surface-plasmon polariton energy in our Ag film into light at the air/Ag-film interface has been experimentally determined to be 2.0%, while the efficiency estimated from light-scattering theory with use of \ensuremath{\sigma} and \ensuremath{\delta} shows 1.9%. These values are considerably smaller than those evaluated by various techniques, including the photoacoustic method.
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