Abstract
The low-frequency optical properties of CuS nanoparticles in the composite samples were measured by the terahertz time-domain spectroscopy. Then, the power absorption, refractive index, complex dielectric function and conductivity of pure CuS nanoparticles are extracted by applying Bruggeman effective medium theory. The measured dielectric function and conductivity are consistent with the Lorentz theory of dielectric response as well as the Drude-smith model of conductivity in the frequency range from 0.2 to 1.5 THz, respectively. In addition, the extrapolation of the measured data indicates that the absorption is dominated by the lattice vibration localized at 4.7 ± 0.2 THz and the time constant for the carrier scattering is only 64.3 fs due to increased electron interaction with interfaces and grain boundaries.
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