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학술지 Optical and Dielectric Properties of Chalcogenide Glasses at Terahertz Frequencies
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저자
강승범, 곽민환, 박봉제, 김성일, 류한철, 정동철, 정세영, 강대원, 최상국, 백문철, 차은종, 강광용
발행일
200912
출처
ETRI Journal, v.31 no.6, pp.667-674
ISSN
1225-6463
출판사
한국전자통신연구원 (ETRI)
DOI
https://dx.doi.org/10.4218/etrij.09.1209.0028
협약과제
09MB1400, THz파 발진 변환 검출기 및 신호원, 강광용
초록
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.
키워드
Absorption coefficient, Chalcogenide glass, Complex dielectric constant, Complex refractive index, Terahertz time-domain spectroscopy
KSP 제안 키워드
Absorption Coefficient, Chalcogenide glass(ChG), Complex Dielectric Constant, Frequency Range, Index n, Optical and dielectric properties, Phonon modes, SE 6, Sellmeier equation, Terahertz frequency, amorphous materials