Metal permittivity

For the discussion of the sciences. Physics problems, chemistry equations, biology weirdness, it all goes here.

Moderators: gmalivuk, Moderators General, Prelates

User avatar
Posts: 947
Joined: Sat Nov 11, 2006 2:58 pm UTC
Location: Australia

Metal permittivity

Postby Minerva » Tue Sep 26, 2017 11:01 am UTC

Given a known bulk plasma frequency (say 3.7 PHz for aluminium), and a known incident wavelength (say 500nm), what's the expression for the relative permittivity of the metal?

For context, consider a plasmonic device that acts as a filter, with a nanoscale grid of holes in metal.

The maximum transmission wavelength at normal incidence is given by lambdamax = (a / sqrt(i2 + j2)) * sqrt((Em * Ed) / (Em + Ed))

Here, Em is the metal permittivity of interest, Ed is the permittivity of the dielectric substrate, say 4(ish) for SiO2.
(a is the lattice spacing.) ... al-imaging
...suffer from the computer disease that anybody who works with computers now knows about. It's a very serious disease and it interferes completely with the work. The trouble with computers is you play with them. They are so wonderful. - Richard Feynman

Return to “Science”

Who is online

Users browsing this forum: No registered users and 8 guests