Metal-Dielectric Dual Bandpass Filter
This filter transmits two fairly narrow bands of wavelengths centered at 770 and 920 nm.|
This design is for normal incidence on a BK7 (ordinary) glass substrate. Three materials are used: Au, SiO2, and TiO2. Starting with a thin, one-layer design, TFCalc's needle/tunneling method produced a sequence of designs of increasing complexity. The design (whose performance is shown above) consists of 13 layers.
Here is the design, with the first layer closest to the substrate and thickness given in nm:
AU 16.58 SIO2 115.39 TIO2 96.33 SIO2 49.67 TIO2 39.24 SIO2 152.40 TIO2 93.69 SIO2 270.66 AU 4.16 SIO2 10.49 TIO2 95.25 SIO2 102.01 AU 10.76
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