1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Surface plasmon wavevector calculations

  1. Jul 5, 2012 #1
    I am trying to calculate the wavevector of a surface plasmon. The magnitude of the wavevector is given by:

    k = [itex]\frac{ω}{c}[/itex][itex]\sqrt{\frac{ε_1ε_2}{ε_1+ε_2}}[/itex]

    where ε1 is the dielectric constant for air and ε2 is the dielectric constant for the metal. However, according to the Drude model, the dielectric constant for a metal is not a constant but is a complex function of wavelength (frequency). I am looking to make this calculation for incident radiation in the mid-infrared (λ = 10 microns or so) where ωτ >> 1. Would using

    ε(ω) = 1 - [itex]\frac{ω_p^2}{ω^2}[/itex]

    work well in this region (where [itex]ω_p[/itex] is the plasma frequency)?
    Last edited: Jul 5, 2012
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted