7 September 2017 Frequency-selective surfaces for infrared imaging
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Bayer filter arrays are commonly added to visible detectors to achieve multicolor sensitivity. To extend this approach to the infrared range, we present frequency selective surfaces that work in the mid-infrared range (MWIR). They are easily integrated in the device fabrication process and are based on a simple operating principle. They consist of a thin metallic sheet perforated with apertures filled with a high-index dielectric material. Each aperture behaves as a separate resonator. Its size determines the transmission wavelength λ. Using an original approach based on the temporal coupled mode theory, we show that metallic loss is negligible in the infrared range, as long as the filter bandwidth is large enough (typically <λ/10). We develop closed-form expressions for the radiative and dissipative loss rates and show that the transmission of the filter depends solely on their ratio. We present a prototype infrared detector functionalized with one such array of filters and characterize it by electro-optical measurements.
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Emeline Lesmanne, Emeline Lesmanne, François Boulard, François Boulard, Roch Espiau Delamaestre, Roch Espiau Delamaestre, Sylvette Bisotto, Sylvette Bisotto, Giacomo Badano, Giacomo Badano, } "Frequency-selective surfaces for infrared imaging", Proc. SPIE 10404, Infrared Sensors, Devices, and Applications VII, 104040K (7 September 2017); doi: 10.1117/12.2273159; https://doi.org/10.1117/12.2273159

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