Figure 2.
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Cross-sections through the (κx,κz)-plane in wavenumber space when κy = 0 and the optic axis lies along the κz-axis. The figure shows the transition from anisotropic (ellipse) to hyperbolic as ε3 changes in incremental steps from a positive to a negative value. The element ε1 = ε2 = 4.0.
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