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. © 2009 Tianjin University of Technology and Springer Berlin Heidelberg.