Microstructured Radiators (original) (raw)
2007
Controlling the spatial or temporal coherence of thermal light a hot body emits when it relaxes to lower states is undoubtedly one of major objectives for improving the efficiency of numerous actual technologies such as thermophotovoltaïc conversion devices, radiative cooling systems, infrared gas sensors and highly directional/narrow band thermal radiators. Until recently thermal sources were considered as objects that were able to emit light only over a broad band of the infrared spectrum.
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Manipulation of Thermal Emission by Use of Micro and Nanoscale Structures
Journal of Heat Transfer, 2012
In high temperature and vacuum applications, for which heat transfer is predominantly by radiation, the material’s surface texture is of substantial importance. Several micro and nanostructures designs have been proposed to enhance a material’s emissivity and its radiative coherence. Control of thermal emission is of crucial concern in the design of infrared sources, in electronic chip coolants, in high-efficiency photovoltaic cells, and in solar energy conversion. In this review paper, we present microscale and nanoscale structures supporting surface waves for obtaining polarization manipulation of thermal emission, extraordinary coherent thermal radiation, bandgap in the spectral emission, spin symmetry breaking of coupled thermal antenna array, and a broadband infrared absorption.
Coherent thermal source formed by periodic microcavities [6883-35]
2008
ABSTRACT An extraordinary coherent thermal emission from an anisotropic microstructure is experimentally and theoretically presented. The enhanced coherency is due to coherent coupling between resonant cavities obtained by surface standing waves, where each cavity supports a localized field that is attributed to coupled surface phonon-polaritons.
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