# Image:Material-dispersion-epsim.png

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Material-dispersion-epsim.png (9KB, MIME type: `image/png`

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Imaginary part of ε for Meep Tutorial/Material dispersion, both analytical (blue line) and numerical (red circles). Polaritonic gap (where Re ε<0) is highlighted in yellow. —Steven G. Johnson

Technically, the blue line is the imaginary part of &epsilon(ω) for real ω, wheras the numerical calculation is the imaginary part of &epsilon(ω) for *complex* ω at a real wavevector. The corresponding analytical &epsilon(ω) for the complex ω is shown as a green line.

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- (del) (cur) 01:03, 1 December 2005 . . Stevenj (Talk | contribs) . . 553×415 (9,205 bytes) (Imaginary part of ε for Meep Tutorial/Material dispersion, both analytical (blue line) and numerical (red circles). Polaritonic gap (where Re ε<0) is highlighted in yellow. ~~~ Technically, the blue line is the imaginary part of &)

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