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Diyala Journal For Pure Science

Scientific Refereed Journal Published By College of Science - University of Diyala


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Diyala Journal For Pure Sciences DJPS

ISRA Impact Factor:3.715

P- ISSN:2222-8373, E-ISSN:2518-9255

Volume 13, Issue 2, Part 1 , April. 2017


Multiple Cavity Square Narrow and Broad Band Optical Filters for Infrared Region Application


Shireen Mohammed Abed


Year: 2017, Volume: 13, Issue: 2, Part: 1


Pages: 102-115, DOI: http://dx.doi.org/10.24237/djps.1302.175A


Language: English


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 In this work, theoretically optimization design of wide and narrow band pass filters have been suggested within  middle- infrared region (MIR) that ranged from 9000 nm to 12000 nm. For the numerical calculation, use Germanium (Ge) as the substrate, Zinc sulfide (ZnS) and Cryolite (Na3A1F6) as high and low refractive index respectively. The results shows that, for normal incidence yields  the transmittance is high ( T ˃  99.5 ) at the center of  Design wavelength  (λo). Also, when the angle of incidence increase, The transmittance of electric polarization decreases and that of magnetic polarization increases  , As in the case for  the proposed design: Air/(LH)4LHHL(HL)4H(LH)4LHHL(HL)4(HL)4(HL)4HH(LH)4 (LH)4/Ge (TE=96.79) and (TM=99.57) at the angle 30 .


 Keywords : Transmittance , Filter, Coating, Oblique incidence.

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