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(a) Optical transmittance and (b) optical microscope images (the scale bar is 10 μm) and AFM images of AgNW films (the scale bar is 5 μm). Four samples with different Ag NW filling fractions of 1.5% (red), 6% (green), 9.5% (orange), and 14.8% (blue) are prepared.
The THz signals measured in (a) time-domain and (b) frequency-domain for each sample (gray: reference substrate of MgO, red: 1.5%, green: 6%, orange: 9.5%, and blue: 14.8% filling fraction). Inset: Sample modulation scheme.
(a) Real and (b) imaginary parts of the effective conductivity of each sample. They are directly obtained from the THz signals in Fig. 2 . Insets of (a) and (b) present the complex conductivity of Ag NWs themselves for each sample after applying the MG EMT. They are fitted by the Drude-Smith model. (c) The integrated values of real conductivity normalized by the conductivity of 14.8% filling fraction. (d) The THz response of the Ag NWs in two mixtures of Ag NW and air is extracted from MG EMT. It is strongly dependent of the THz polarization.
Fitting parameters of the Drude-Smith model ( , plasma frequency; τ, scattering time; N e, charge carrier density).
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