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Design of an optimized multilayer absorber into the MWIR and LWIR bands

In this article, we propose a new approach for effective detection of infrared (IR) radiation, using an absorber consisting of two successive metal‐dielectric layers. To this end, a low cost, high‐efficiency composite IR absorber structure consisting of a set of two double‐layered element of thin metal layers paired with dielectric materials is presented. The proposed composite absorber can be tuned based on the metal layer sheet resistance and the thickness of various poly‐Si media; by appropriate choice of physical, electrical, and optical parameters, so that maximal absorption over both mid‐wave IR band regions (MWIR) and long wavelength IR band regions (LWIR) (3–12 μm), is achieved. The outcome of study indicates that the presented absorber configuration may be a promising candidate for integration into microbolometric detectors; while offering improved efficiency and functionality, for not critical timing applications, synchronously in both the MWIR and LWIR atmospheric thermal windows.