Dielectric properties of single-walled carbon nanotubes in the terahertz frequency range
Dielectric properties of single-walled carbon nanotubes in the terahertz frequency range
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DOI：
10.1063/1.2753747
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发表时间：
2007-07
影响因子：
4
通讯作者：
H. Nishimura;N. Minami;R. Shimano
中科院分区：
文献类型：
--
作者：
H. Nishimura;N. Minami;R. Shimano
报道了分散在聚合物薄膜中的单壁碳纳米管(SWCNTs)的太赫兹时域光谱，其频率范围从0.2-20THz。在不使用Kramers-Kronig分析的情况下，得到了复合薄膜的复介电函数，并利用有效介质理论提取了单壁碳纳米管的介电函数。介电函数的实部在低于2THz的低频下表现出很大的值。电导谱在3THz附近有一个峰值。光谱行为符合过阻尼洛伦兹振子模型，表明了曲率诱导的小能隙单壁碳纳米管的响应。
The authors report on the terahertz time-domain spectroscopy of single-walled carbon nanotubes (SWCNTs) dispersed in a polymer film in a broad frequency range from 0.2to20THz. The complex dielectric function of the composite film is obtained without using Kramers-Kronig analysis, from which the dielectric function of SWCNTs is extracted by using the effective medium theory. The real part of the dielectric function exhibits very large values at low frequency below 2THz. The conductivity spectrum shows a peak around 3THz. The spectral behavior is consistent with overdamped Lorentz oscillator model, indicating the response of curvature-induced small-gap SWCNTs.