Study of optical and dielectric properties of annealed ZnO nanoparticles in the terahertz regime

Abstract

The frequency-dependent optical and dielectric properties of annealed ZnO nanoparticles in the range of 0.1 to 0.9 THz are studied by using terahertz time-domain spectroscopy (THz-TDS). The refractive index, power absorption and complex dielectric constants are obtained and the experimental results are well fit with a simple effective medium theory in conjunction with a pseudo-harmonic model. This study reveals that annealed ZnO nanoparticles exhibit the similar phonon response characteristics to the single ZnO crystal and other ZnO nanostructures, such as tetrapods and nanowires.

Keywords

Power Absorption / Complex Dielectric Constant / Sample Pulse / Terahertz Beam / Terahertz Regime

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