Near infrared quazi-omnidirectional reflector in chalcogenide glasses

被引：8
作者：
Kohoutek, T. [1 ]
Orava, J. [1 ]
Prikryl, J. [1 ]
Mistrik, J. [2 ]
Wagner, T. [1 ]
Frumar, M. [1 ]
机构：
[1] Univ Pardubice, Dept Gen & Inorgan Chem, Fac Chem Technol, Pardubice 53210, Czech Republic
[2] Univ Pardubice, Dept Phys, Fac Chem Technol, Pardubice 53210, Czech Republic
来源：
OPTICAL MATERIALS | 2009年 / 32卷 / 01期
关键词：
Amorphous semiconductors; Chalcogenides; Multilayers; Reflectors; Ellipsometry; POLYMER;
D O I：
10.1016/j.optmat.2009.07.004
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The quazi-omnidirectional reflector was designed as a planar quarter wave stack consisting of the alternating amorphous chalcogenide Ge25S75 and Sb40Se60 films. Photonic bandgap calculation of the intended reflector predicted similar to 240 nm omnidirectional and similar to 450 rim normal incidence first-order bandgaps centred near 1.55 mu m for appropriate values of the index of refraction and thickness of the films. The TEM and HR-TEM images of the prepared 7.5 pairs reflector verified good periodicity, smooth interface and amorphous structure of the chalcogenide films deposited by thermal and flash evaporation, respectively. The optical reflectivity measurements revealed 98.8% normal incidence stopband of the reflector at 1.55 mu m. We also report the ellipsometry study of the prepared reflector. The TEM and ellipsometry studies confirmed the thickness variation of prepared individual layers to be 7 and 9 nm, respectively, compared to theoretical predictions. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：154 / 158
页数：5
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