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While optical pass-band and stop-band filters are widely used, angle-selective transmission and reflection filtering remain less explored, even though it is uniquely promising for creating complex patterns of thermal radiation in a potentially lossless fashion. The authors develop a concept for reflection filters that exploit resonant couplings to tune angle-sensitive dips in transmission, for arbitrary directional selectivity. These structures may find many applications, including daytime radiative cooling, sensitive detectors for infrared telescopes, and high-fidelity thermoluminescent spectroscopy.

Angle-Selective Reflective Filters for Exclusion of Background Thermal Emission