Shaped selective thermal emitter
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United States of America Patent
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Mar 13, 2012
Grant Date -
Jun 25, 2009
app pub date -
Dec 20, 2007
filing date -
Dec 20, 2007
priority date (Note) -
Expired
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Abstract
A geometrically shaped photonic crystal structure consisting of alternating layers of thin films is heated to emit light. The structure may include index matching layers or a cavity layer to enhance emissions. The layer thicknesses of the structure may be spatially varied to modify the emission spectrum versus emission angle. The self-focusing structure may be fabricated into a convex electrically heated wire filament light bulb, a concave visible thermophotovoltaic emitter, a concentric directional heat exchanger, an electronic display, or a variety of irregularly shaped remotely read temperature or strain sensors.
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