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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Optical and Dielectric Properties of Chalcogenide Glasses at Terahertz Frequencies

  • Kang, Seung-Beom (Convergence Components & Materials Research Laboratory, ETRI) ;
  • Kwak, Min-Hwan (Convergence Components & Materials Research Laboratory, ETRI) ;
  • Park, Bong-Je (Convergence Components & Materials Research Laboratory, ETRI) ;
  • Kim, Sung-Il (Convergence Components & Materials Research Laboratory, ETRI) ;
  • Ryu, Han-Cheol (Convergence Components & Materials Research Laboratory, ETRI) ;
  • Chung, Dong-Chul (School of Information & Computer, Woosuck University) ;
  • Jeong, Se-Young (Convergence Components & Materials Research Laboratory, ETRI) ;
  • Kang, Dae-Won (Convergence Components & Materials Research Laboratory, ETRI) ;
  • Choi, Sang-Kuk (Convergence Components & Materials Research Laboratory, ETRI) ;
  • Paek, Mun-Cheol (Convergence Components & Materials Research Laboratory, ETRI) ;
  • Cha, Eun-Jong (Department of Biomedical Engineering, School of Medicine, Chungbuk National University) ;
  • Kang, Kwang-Yong (Convergence Components & Materials Research Laboratory, ETRI)
  • Received : 2009.05.13
  • Accepted : 2009.10.23
  • Published : 2009.12.31
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Abstract

Terahertz time-domain spectroscopy has been used to study the optical and dielectric properties of three chalcogenide glasses: $Ge_{30}As_8Ga_2Se_{60}$, $Ge_{35}Ga_5Se_{60}$, and $Ge_{10}As_{20}S_{70}$. The absorption coefficients ${\alpha}({\nu})$, complex refractive index n(${\nu}$), and complex dielectric constants ${\varepsilon}({\nu})$ were measured in a frequency range from 0.3 THz to 1.5 THz. The measured real refractive indices were fitted using a Sellmeier equation. The results show that the Sellmeier equation fits well with the data throughout the frequency range and imply that the phonon modes of glasses vary with the glass compositions. The theory of far-infrared absorption in amorphous materials is used to analyze the results and to understand the differences in THz absorption among the sample glasses.

Keywords

References

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