光学学报, 2001, 21 (3): 313, 网络出版: 2006-08-10
溅射气压对Ge2Sb2Te5薄膜光学常数的影响
Effects of Sputtering Ar Pressure on the Optical Constants of Ge2Sb2Te5 Thin Films
摘要
实验研究了氩气气压对溅射制备的Ge2Sb2Te5薄膜的光学常数随波长变化的影响,结果表明:随薄膜制备时氩气气压的增加,Ge2Sb2Te5薄膜的折射率n先增大后减小,而消光系数k先减小后增大。二者都随波长的变化而变化,且在长波长范围变化较大,短波长范围变化较小,解释了溅射气压对Ge2Sb2Te5薄膜的光学常数影响的机理。
Abstract
The effects of sputtering Ar pressure on optical constants (n,k) of Ge2Sb2Te5 thin films in the wavelength range from 300 nm to 900 nm were studied. The results show that the refractive index (n) first increases and then decreases with increasing Ar pressure, whereas the extinction coefficient (k) changes with Ar pressure in a contrary way to that of n. The extent of the influence of Ar pressure on n and k also changes with wavelength. It is greater in the long wavelength region than in the short wavelength region. The mechanism on which the optical constants of the Ge2Sb2Te5 thin films are affected by the Ar pressure is discussed based on the variation of the atomic density and microstructure of the films.
谢泉, 侯立松, 干福熹, 阮昊, 李晶, 李进延. 溅射气压对Ge2Sb2Te5薄膜光学常数的影响[J]. 光学学报, 2001, 21(3): 313. 谢泉, 侯立松, 干福熹, 阮昊, 李晶, 李进延. Effects of Sputtering Ar Pressure on the Optical Constants of Ge2Sb2Te5 Thin Films[J]. Acta Optica Sinica, 2001, 21(3): 313.