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Fig. 1 | Nano Convergence

Fig. 1

From: Metamaterials and imaging

Fig. 1

Isofrequency surface. a Elliptical isofrequency surface. b and c Hyperbolic isofrequency surface with (b) ε  = ε x  = ε y  < 0, ε  = ε z  > 0, and (c) ε  = ε x  = ε y  > 0, ε  = ε z  < 0

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