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Surface Plasmons

  1. Apr 28, 2010 #1
    I'm still trying (yet unsuccessfully) to deal with surface plasmons, and I still hope on your help.
    let me start like this:
    I find in the review that:

    We consider an interface in the xy-plane between two half-infinite spaces, 1 and 2, of materials the optical properties of which are described by their complex frequency-dependent dielectric functions [tex]\epsilon[/tex]1([tex]\omega[/tex]) and [tex]\epsilon[/tex]2([tex]\omega[/tex]), respectively. We ignore magnetic materials. Surface polaritons can only be excited at such an interface if the dielectric displacement [tex]\stackrel{\rightarrow}{D}[/tex] of the electromagnetic mode has a component normal to the surface which can induce a surface charge density [tex]\sigma[/tex],

    and here I found that I don't quite understand why there must be a component, normal to the surface, and what is the connection between surface charge density and surfacce plasmons.

    Any help will be greatfully appreciated. :confused:
  2. jcsd
  3. Apr 28, 2010 #2


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    Staff Emeritus
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    About the normal components: think Gauss' Law.

    For the connection between surface charge density and surface plasmons, go back to square one, and start at the definition of a surface plasmon.
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