1Massachusetts Institute of Technology (United States) 2Univ. of Rochester (United States) 3Changchun Institute of Optics, Fine Mechanics and Physics (China)
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We analyze the impact of angular selectivity on the radiative cooling performance of thermal emitters. We show that combining angular and spectral selectivity enables realizing deep subfreezing temperatures. While angularly selective thermal emitters are robust to environmental effects, they require management of non-radiative heat transfer processes. We introduce a general scheme to realize angularly and spectrally selective absorption/emission using a thin film stack consisting with a total thickness of ~ 9 μm; an order of magnitude less than previously proposed angular selective thermal emitters. We finally discuss the prospects of angular selectivity based on conic mirrors.
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