Optical and dielectric properties of ZnO tetrapod structures at terahertz frequencies
Jiaguang HanShanghai Institute of Applied Physics , Chinese Academy of Sciences, Shanghai 201800, People’s Republic of ChinaZhiyuan ZhuShanghai Institute of Applied Physics , Chinese Academy of Sciences, Shanghai 201800, People’s Republic of ChinaSanith RayOklahoma State University School of Electrical and Computer Engineering, , Stillwater, Oklahoma 74078Abul K. AzadOklahoma State University School of Electrical and Computer Engineering, , Stillwater, Oklahoma 74078Weili ZhangOklahoma State University School of Electrical and Computer Engineering, , Stillwater, Oklahoma 74078Mingxia HeOklahoma State University School of Electrical and Computer Engineering, , Stillwater, Oklahoma 74078 and College of Precision Instrument and Optoelectronics Engineering, , Tianjin 300072, People’s Republic of ChinaShihong LiUniversity of Georgia Nanoscale Science and Engineering Center, Department of Physics and Astronomy, , Athens, Georgia 30602Yiping ZhaoUniversity of Georgia Nanoscale Science and Engineering Center, Department of Physics and Astronomy, , Athens, Georgia 30602
2006en
ABI
Аннотация
The low-frequency optical and dielectric properties of ZnO tetrapod structures prepared by thermophysical method were studied by terahertz time-domain spectroscopy. The power absorption, refractive index, and the complex dielectric function were measured in the frequency range from 0.2to3.5THz. Based on a simple effective medium theory, the low-frequency dielectric properties of ZnO tetrapods were found to be associated with the transverse optical E1 phonon mode, which is consistent with that observed in bulk single-crystal ZnO.
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