Understanding terahertz optical properties of amorphous carbon thin films

The nanostructure of amorphous carbon thin film is described in terms of a disordered conductive sp2 phase embedded in an electrically insulating sp3 matrix. The conductive sp2 phase is dominated by Drude type free-carries response, and the carrier conductive between sp2 clusters is hopping. The two...

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Bibliographic Details
Published in:Carbon (New York) 2013-11, Vol.64, p.67-71
Main Authors: Wang, H., Guo, J.Q., Zhou, Y.S.
Format: Article
Language:English
Subjects:
Carbon
Chemistry
Colloidal state and disperse state
Complex permittivity
Cross-disciplinary physics: materials science
rheology
Dielectric constant
Exact sciences and technology
General and physical chemistry
Materials science
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Nanostructure
Optical properties
Permittivity
Phonons
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Physics
Thin films
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Summary:The nanostructure of amorphous carbon thin film is described in terms of a disordered conductive sp2 phase embedded in an electrically insulating sp3 matrix. The conductive sp2 phase is dominated by Drude type free-carries response, and the carrier conductive between sp2 clusters is hopping. The two conductivities are in a serial configuration under a percolation approximation. In view of this, we extend Shimakawa’s model for compact nanoparticles [14] to amorphous carbon thin films in order to provide understanding on its terahertz (THz) optical complex permittivity. Furthermore, the contribution of phonons for THz optical complex permittivity is included in the scope of Debye theorem phenomenologically. Considering the condition of ω
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2013.07.028