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The dispersion curve indicates the relation between the energy and momentum of an oscillation quantum, e.g. a photon, a plasmon or a phonon.

- light $$\omega \left(k\right)=k\cdot {\mathit{c}}_{0}\cdot \sqrt{\frac{1}{{\epsilon}_{1}}}$$
- Surface plasmons $$\omega \left(k\right)=k\cdot {\mathit{c}}_{0}\cdot \sqrt{\frac{1}{{\epsilon}_{1}}+\frac{1}{{\epsilon}_{2}}}$$

The slope of the dispersion curve is equal to the speed of propagation of the vibration.