Far-infrared conductivity of CuS nanoparticles measured by terahertz time-domain spectroscopy

doi:10.1088/1674-1056/19/4/043302

中国物理B ›› 2010, Vol. 19 ›› Issue (4): 43302-043302.doi: 10.1088/1674-1056/19/4/043302

Far-infrared conductivity of CuS nanoparticles measured by terahertz time-domain spectroscopy

张振伟¹, 施宇蕾¹, 杨玉平², 冯帅², 王文忠²

(1)Department of Physics, Capital Normal University, Beijing 100048, China; (2)School of Science, Minzu University of China, Beijing 100081, China

收稿日期:2009-07-28 修回日期:2009-08-14 出版日期:2010-04-15 发布日期:2010-04-15
基金资助:
Project supported by the Research Foundation of the State Ethnic Affairs Commission of People's Repulic of China (Grant No.~09ZY012), the National Natural Science Foundation of China (Grant No.~10904176), the ``Project 985'', and the ``Project 211'' of Mi

Far-infrared conductivity of CuS nanoparticles measured by terahertz time-domain spectroscopy

Yang Yu-Ping(杨玉平)^a)^†, Zhang Zhen-Wei(张振伟)^b), Shi Yu-Lei(施宇蕾)^b), Feng Shuai(冯帅)^a), and Wang Wen-Zhong(王文忠)^a)

^a School of Science, Minzu University of China, Beijing 100081, China; ^b Department of Physics, Capital Normal University, Beijing 100048, China

Received:2009-07-28 Revised:2009-08-14 Online:2010-04-15 Published:2010-04-15
Supported by:
Project supported by the Research Foundation of the State Ethnic Affairs Commission of People's Repulic of China (Grant No.~09ZY012), the National Natural Science Foundation of China (Grant No.~10904176), the ``Project 985'', and the ``Project 211'' of Mi

摘要/Abstract

摘要： This paper reports that terahertz time-domain spectroscopy is used to measure the optical properties of CuS nanoparticles in composite samples. The complex conductivity of pure CuS nanoparticles is extracted by applying the Bruggeman effective medium theory. The experimental data are consistent with the Drude--Smith model of conductivity in the range of 0.2--1.5~THz. The results demonstrate that carriers become localized with a backscattering behaviour in small-size nanostructures. In addition, the time constant for the carrier scattering is obtained and is only 64.3~{fs} due to increased electron interaction with interfaces and grain boundaries.

Abstract: This paper reports that terahertz time-domain spectroscopy is used to measure the optical properties of CuS nanoparticles in composite samples. The complex conductivity of pure CuS nanoparticles is extracted by applying the Bruggeman effective medium theory. The experimental data are consistent with the Drude--Smith model of conductivity in the range of 0.2--1.5 THz. The results demonstrate that carriers become localized with a backscattering behaviour in small-size nanostructures. In addition, the time constant for the carrier scattering is obtained and is only 64.3 fs due to increased electron interaction with interfaces and grain boundaries.

Key words: terahertz time-domain spectroscopy, conductivity, effective medium theory, Drude--Smith model

中图分类号: (Nanocrystals, nanoparticles, and nanoclusters)

78.67.Bf

73.63.Bd (Nanocrystalline materials) 78.70.Gq (Microwave and radio-frequency interactions) 61.72.Mm (Grain and twin boundaries) 78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))

杨玉平, 张振伟, 施宇蕾, 冯帅, 王文忠. Far-infrared conductivity of CuS nanoparticles measured by terahertz time-domain spectroscopy[J]. 中国物理B, 2010, 19(4): 43302-043302.

Yang Yu-Ping(杨玉平), Zhang Zhen-Wei(张振伟), Shi Yu-Lei(施宇蕾), Feng Shuai(冯帅), and Wang Wen-Zhong(王文忠). Far-infrared conductivity of CuS nanoparticles measured by terahertz time-domain spectroscopy[J]. Chin. Phys. B, 2010, 19(4): 43302-043302.

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Far-infrared conductivity of CuS nanoparticles measured by terahertz time-domain spectroscopy

Far-infrared conductivity of CuS nanoparticles measured by terahertz time-domain spectroscopy

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