Determining small refractive index contrast in chalcogenide-glass pairs at mid-infrared wavelengths
Determining small refractive index contrast in chalcogenide-glass pairs at mid-infrared wavelengths
复制标题
DOI：
10.1364/ome.9.002022
复制
发表时间：
2019-05
影响因子：
2.8
通讯作者：
Y. Fang;D. Furniss;D. Jayasuriya;H. Parnell;Richard W. Crane;Zhuoqi Tang;E. Barney;C. Canedy;Christopher Kim;M. Kim;C. D. Merritt;W. Bewley;I. Vurgaftman;J. Meyer;A. Seddon;T. Benson
中科院分区：
文献类型：
--
作者：
Y. Fang;D. Furniss;D. Jayasuriya;H. Parnell;Richard W. Crane;Zhuoqi Tang;E. Barney;C. Canedy;Christopher Kim;M. Kim;C. D. Merritt;W. Bewley;I. Vurgaftman;J. Meyer;A. Seddon;T. Benson
采用热纤维压制技术制备了一种双组分薄膜（Ge20Sb10Se70/Ge20Sb10Se67S3原子%芯/包层玻璃），其中两种玻璃遵循相同的纤维后加工。提出了一种简单的方法，利用正入射透射光谱来确定波长范围为2 ~ 25µm的折射率对比，误差小于±0.002。采用改进的Swanepoel方法计算得到的两种组合物的数值孔径与棱镜最小偏差测量值的误差在±0.011以内。结果表明，在Ge-Sb-Se玻璃体系中引入3个原子% S降低了其折射率，使可见光带隙、远红外基本振动吸收带和零色散波长发生蓝移。
A two-composition thin film (Ge20Sb10Se70/Ge20Sb10Se67S3 atomic % core/cladding glasses) was fabricated using a hot-fibre-pressing technique in which both glasses follow the same post-fibre processing. A simple approach is proposed that uses normal incidence transmission spectra to determine their refractive index contrast over the wavelength range from 2 to 25 µm with an error of less than ± 0.002. Using an improved Swanepoel method, the calculated numerical aperture of these two compositions was within ± 0.011 of that obtained from prism minimum deviation measurements. Results show that introducing 3 atomic % S into the Ge-Sb-Se glass system lowered the refractive index and blue-shifted the visible optical bandgap, the far-infrared fundamental vibrational absorption bands and the zero-dispersion wavelength.