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Optical and dielectric properties of ZnO tetrapod structures at terahertz frequencies

Appl. Phys. Lett. 89, 031107 (2006); doi:10.1063/1.2222329

Published 18 July 2006

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Jiaguang Han and Zhiyuan Zhu
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China

Sanith Ray, Abul K. Azad, and Weili Zhang
School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078

Mingxia He
School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078 and College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, People's Republic of China

Shihong Li and Yiping Zhao
Nanoscale Science and Engineering Center, Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602
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 0.2  to  3.5  THz. 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. ©2006 American Institute of Physics
History: Received 25 February 2006; accepted 24 May 2006; published 18 July 2006
Permalink: http://link.aip.org/link/?APPLAB/89/031107/1
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KEYWORDS and PACS

Keywords
PACS
  • 78.67.Bf
    Optical properties of nanocrystals and nanoparticles
  • 73.63.Bd
    Nanocrystalline materials (electronic transport)
  • 78.20.Ci
    Optical constants including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity
  • 77.22.Ch
    Permittivity (dielectric function)
  • 63.22.+m
    Phonons or vibrational states in low-dimensional structures and nanoscale materials
  • 78.70.Gq
    Microwave and radio-frequency interactions with condensed matter
  • YEAR: 2006

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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