Angle and polarization tolerant midinfrared dielectric filter designed by genetic algorithm optimization

Seokho Yun; Bossard, Jeremy A.; Mayer, Theresa S.; Werner, Douglas H.
May 2010
Applied Physics Letters;5/31/2010, Vol. 96 Issue 22, p223101
Academic Journal
We report a dielectric frequency selective surface filter with an angularly tolerant, polarization independent stop band designed at a midinfrared wavelength of 3.0 μm. The structure, consisting of a doubly-periodic amorphous silicon grating supported by a polyimide membrane, was optimized using a genetic algorithm to have a transmission stop band with a 3.33% 10 dB bandwidth for incidence angles as large as 10° from normal. The measured properties of the fabricated filter were within 1% of theoretical predictions. This strategy provides a practical and efficient approach to creating advanced dielectric filters for highly customized infrared optical device and coating applications.


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