A new optical method: the spatial intensity distribution measurement a
nd analysis of light, emitted by surface plasmons excited at resonance
conditions in an ATR equipment was tested at 632.8 and 1064 nm wavele
ngths. Other methods to determine the plasmon decay length (scanning t
unnel microscopy and the width of ATR curves) resulted in similar valu
es for 30-80 nm thick Ag and Au films. An example of application is de
monstrated.