Study of optical and dielectric properties of annealed ZnO nanoparticles in the terahertz regime |
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| Authors: | Ming-wei Wang Boon Kuan Woo Zhen Tian Jia-guang Han Wei Chen and Wei-li Zhang |
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| Affiliation: | (1) School of Materials Science and Engineering, Jiangsu University of Science and Technology, Jiangsu, 212003, China;(2) School of Chemistry and Environmental Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100083, China;(3) Zhongshan Torch polytechnic, Zhongshan, Guangdong, 528436, China; |
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| 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. |
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