Calculated real part of ε⊥ for the HMM showing deep negative band Description: Plot of Re[ε⊥(iξ)] vs frequency, dipping to –14.2 in 12–45 THz. Image: Dispersion curve for hyperbolic metamaterial permittivity (negative ε⊥ regime). Caption: "FIG. 2: Real part of perpendicular permittivity ε⊥(iξ) vs Matsubara frequency for the Ag/SiO₂ hyperbolic metamaterial, showing Type-II regime (ε⊥ < –14)."
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