Indiana University

Flir Surveillance, Inc.

Icx Technologies Gmbh

William Schaich

Irina Puscasu

A wavelength selective structure for selectively reflecting or absorbing incident electromagnetic visible or infrared radiation. The wavelength selective structure includes a wavelength selective structure with a plurality of layers, including a compound layer forming a plurality of surface elements, an electrically isolating intermediate layer, wherein the compound layer is in contact with a first surface of the electrically isolating intermediate layer, and a continuous electrically conductive layer in contact with a second surface of the electrically isolating intermediate layer. The compound layer includes at least one metallic layer and at least one dielectric layer. The selective surface has at least one resonance band for selectively reflecting or absorbing visible or infrared radiation based on a resonant electromagnetic coupling between the plurality of surface elements and the continuous electrically conductive layer.

Multiband wavelength selective structure

Methods and apparatus for providing a tunable absorption band in a wavelength selective surface are disclosed. A device for selectively absorbing incident electromagnetic radiation includes an electrically conductive surface layer including an arrangement of multiple surface elements. The surface layer is disposed at a nonzero height above a continuous electrically conductive layer. An electrically isolating intermediate layer defines a first surface that is in communication with the electrically conductive surface layer. The continuous electrically conductive backing layer is provided in communication with a second surface of the electrically isolating intermediate layer. The arrangement of surface elements couples at least a portion of the incident electromagnetic radiation between itself and the continuous electrically conductive backing layer, such that the resonant device selectively absorbs incident radiation, and reflects a portion of the incident radiation that is not absorbed.

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Bloomington, IN, United States of America

William Schaich