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Journal Article
Optical and Dielectric Properties of Chalcogenide Glasses at Terahertz Frequencies
- Authors
- Seung Beom Kang, Min Hwan Kwak, Bong Je Park, Sungil Kim, Han Cheol Ryu, Dong Chul Chung, Se Young Jeong, Dae Won Kang, Sang Kuk Choi, Mun Cheol Paek, Eun Jong Cha, Kwang Yong Kang
- Issue Date
- 2009-12
- Citation
- ETRI Journal, v.31, no.6, pp.667-674
- ISSN
- 1225-6463
- Publisher
- 한국전자통신연구원 (ETRI)
- Language
- English
- Type
- Journal Article
- Abstract
- Terahertz time-domain spectroscopy has been used to study the optical and dielectric properties of three chalcogenide glasses: Ge30As 8Ga2Se60, Ge35Ga5Se 60, and Ge10As20S70. The absorption coefficients 慣 (館), complex refractive index n(館), and complex dielectric constants 琯 (館) 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 farinfrared absorption in amorphous materials is used to analyze the results and to understand the differences in THz absorption among the sample glasses. Copyright © 2009 ETRI.
- KSP Keywords
- Chalcogenide glass(ChG), Complex Dielectric Constant, Frequency Range, Index n, Optical and dielectric properties, Phonon modes, SE 6, Sellmeier equation, Terahertz frequency, absorption coefficients, amorphous materials