Infrared frequency selective surfaces for sensor applications

D. W. Peters; G. R. Hadley; A. A. Cruz-Cabrera; L. I. Basilio; J. R. Wendt; S. A. Kemme; T. R. Carter; S. Samora

doi:10.1117/12.818912

6 May 2009 Infrared frequency selective surfaces for sensor applications

D. W. Peters, G. R. Hadley, A. A. Cruz-Cabrera, L. I. Basilio, J. R. Wendt, S. A. Kemme, T. R. Carter, S. Samora

Proceedings Volume 7298, Infrared Technology and Applications XXXV; 72983L (2009) https://doi.org/10.1117/12.818912
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

We show design, modeling, fabrication, and characterization results for high-transmission broad-angle frequency selective surfaces (FSSs) in the mid-infrared. The single metal layer of a FSS allows its incorporation directly into focal plane array (FPA) designs, thus allowing direct integration of the filtering and polarizing properties of the FSS into sensors from single photodetectors to FPAs. In thin film filter designs the number of layers and film thicknesses may vary pixel-to-pixel, making fabrication difficult. In contrast, changes in spectral passband or polarization state are easily accomplished with changes to the FSS pattern. We have designed, fabricated, and tested FSSs of patterned gold on a GaAs substrate. Designs include single metal layers and a metal plus a dielectric layer. Design and modeling were performed using rigorous coupled wave analysis (RCWA). Further simulations were performed using a 3D Helmholtz code. All simulations account for the loss and dispersion of the metal at these wavelengths. FSSs with narrowband and broadband capabilities and for polarizing and non-polarizing applications were designed. We will show measured results of both reflection and transmission over a broad spectral (covering all of the mid and thermal infrared) and angular (near normal to near grazing) range. These measurements compare favorably with the modeled results.

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D. W. Peters, G. R. Hadley, A. A. Cruz-Cabrera, L. I. Basilio, J. R. Wendt, S. A. Kemme, T. R. Carter, and S. Samora "Infrared frequency selective surfaces for sensor applications", Proc. SPIE 7298, Infrared Technology and Applications XXXV, 72983L (6 May 2009); https://doi.org/10.1117/12.818912

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