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

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4 Author(s)
Seokho Yun ; Department of Electrical Engineering, Center for Nanoscale Science, The Pennsylvania State University, University Park, Pennsylvania 16802, USA ; Bossard, J.A. ; Mayer, T.S. ; Werner, D.H.

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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.

Published in:

Applied Physics Letters  (Volume:96 ,  Issue: 22 )