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. 2014 Sep 11;4:6340. doi: 10.1038/srep06340

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Characterization of GCHMM: (a) Experimentally determined permittivity values of Ag and Al₂O₃ thin films. The red and blue lines represent the real and imaginary permittivity values of Ag, respectively and black line represents the permittivity values of Al₂O₃. (b) Real parts of effective permittivity of Ag/Al₂O₃ HMM determined with effective media theory. The Ag/Al₂O₃ HMM shows hyperbolic dispersion at λ ≥ 430 nm.