Figure 3 | Scientific Reports

Figure 3

From: Enhanced terahertz conductivity in ultra-thin gold film deposited onto (3-mercaptopropyl) trimethoxysilane (MPTMS)-coated Si substrates

Figure 3

The ratio of real (a) and imaginary (b) parts of conductivity of the MPTMS-coated samples to the uncoated samples at different frequencies; 0.6 THz (black), 1 THz (green), 1.5 THz (red). The thicknesses of films are 7 nm, 7.6 nm, 8.2 nm, 9.3 nm, 10.5 nm, 11.7 nm, 17. 5 nm, 23.3 nm, 50 nm, and 100 nm. The ratio of 5.8 nm is not plotted in (a,b), because the ratio of real conductivity goes infinite (\({\sigma }_{1}\simeq 0\) for the uncoated film). As the film becomes thinner than 11 nm, the ratio increases rapidly (gray dashed region). (c) DC conductivity of MPTMS-coated (blue) and uncoated gold films (red) from Van der Pauw measurements and THz transmission experiments. The film plotted in Fig. 3. (a,b) are described in addition with 5.8 nm MPTMS coated-film. DC conductivity values extracted from two different measurements agree well within the error range.

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