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Proceedings Paper

Frequency-selective surfaces for infrared imaging
Author(s): Emeline Lesmanne; François Boulard; Roch Espiau Delamaestre; Sylvette Bisotto; Giacomo Badano
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Paper Abstract

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.

Paper Details

Date Published: 7 September 2017
PDF: 7 pages
Proc. SPIE 10404, Infrared Sensors, Devices, and Applications VII, 104040K (7 September 2017); doi: 10.1117/12.2273159
Show Author Affiliations
Emeline Lesmanne, Univ. Grenoble Alpes, CEA-LETI (France)
François Boulard, Univ. Grenoble Alpes, CEA-LETI (France)
Roch Espiau Delamaestre, Univ. Grenoble Alpes, CEA-LETI (France)
Sylvette Bisotto, Univ. Grenoble Alpes, CEA-LETI (France)
Giacomo Badano, Univ. Grenoble Alpes, CEA-LETI (France)

Published in SPIE Proceedings Vol. 10404:
Infrared Sensors, Devices, and Applications VII
Paul D. LeVan; Ashok K. Sood; Priyalal Wijewarnasuriya; Arvind I. D'Souza, Editor(s)

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