11 September 2013 Directional thermal emission from a leaky-wave frequency selective surface
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We design, fabricate, and characterize a Frequency Selective Surface (FSS) with directional thermal emission and absorption for long-wave infrared wavelengths (LWIR). The FSS consists of an array of patch antennas connected by microstrips, the ensemble of which supports leaky-wave type modes with forward and backward propagating branches. The branches are designed to intersect at 9.8 μm, and have a broadside beam with 20° FWHM at this wavelength. The absorption along these branches is near-unity. Measurement of the hemispherical directional reflectometer (HDR) shows good agreement with simulation. The ability to control the spectral and directional emittance/absortpance profiles of surfaces has significant applications for radiation heat transfer and sensing.
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Edward C. Kinzel, Edward C. Kinzel, James C. Ginn, James C. Ginn, Eric Z. Tucker, Eric Z. Tucker, Jeffrey A. D'Archangel, Jeffrey A. D'Archangel, Louis A. Florence, Louis A. Florence, Brian A. Lail, Brian A. Lail, Glenn D. Boreman, Glenn D. Boreman, } "Directional thermal emission from a leaky-wave frequency selective surface", Proc. SPIE 8806, Metamaterials: Fundamentals and Applications VI, 880611 (11 September 2013); doi: 10.1117/12.2023772; https://doi.org/10.1117/12.2023772

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