Open AccessEXTENSION OF HIGH REFLECTANCE BAND WIDTH FOR FAR INFRARED SPECTRAL REGION : (1)
Author(s) -
Haifa'a Gh. Rashid
Publication year - 2004
Publication title -
mağallaẗ baġdād li-l-ʿulūm
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.167
H-Index - 6
eISSN - 2411-7986
pISSN - 2078-8665
DOI - 10.21123/bsj.1.2.247-252
Subject(s) - reflectivity , isotropy , optics , maxima and minima , stack (abstract data type) , materials science , computation , dielectric , bandwidth extension , multi band device , optoelectronics , mathematics , physics , computer science , telecommunications , algorithm , mathematical analysis , speech coding , antenna (radio) , programming language , audio signal
Extension of bandwidth for high reflectance zone for the spectral region (8-14pm) was studied adapting the concept of contiguous and overlapping high reflectance stacks. Computations was carried out using the modified characteristic matrix theory restricted to near-normal incidence of light on dielectric , homogenous and isotropic symmetrical stack. Certain precautions must be taken in the choice of stacks to avoid deep —reflectance minima from developing within the extended high reflectance region. Results illustrate that the techniques of extending the high reflectance regions are applicable not only to mirrors , but also to short-and long-edge filter and to narrow band pass filters.