Diyala Journal For Pure Science DJPS

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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Abstract    

 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.