Propagation length of the surface plasma wave (SPW)

[Amany Gouda]

Hello,
Many Researchers talked about the following parameters:
1. Propagation length of the surface plasma wave(spw).
2. penetration depth of surface plasma wave(spw).
3. concentration of the (spw).
4. the equation of the interface in vacuum - plasma interface.
I feel confused regarding such above terms and their equations. Is there any person can explain them in much easier way?
Best regards

 

[Tom.G]

A quote from a 10 page article at: https://www.osapublishing.org/oe/viewmedia.cfm?uri=oe-16-14-10455&seq=0
(https://doi.org/10.1364/OE.16.010455)

However, a major drawback of SPPs is their rather short propagation length of typically
a few tens of μm in the visible spectral range due to ohmic losses in the metal.