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

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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