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Visibility of graphene flakes on a dielectric substrate
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9.We take data for the real and imaginary parts of the permittivity of Si from Ref. 10. The imaginary part is substantial only for , so we approximate . The permittivity of is nearly dispersionless in this frequency range (Ref. 11), so we take the dielectric constant as . SiC has some dispersion for these frequencies12 but the imaginary part is negligible so we assume .
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