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Control of thermal emission by selective heating of periodic structures
1Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Abstract:
We predict that thermal emission can be controlled by selective heating of periodic structures. Previous studies on thermal emission modification via photonic crystals have been limited to uniform temperature. We consider frequency-dependent nonuniform absorption in a periodic structure and show that thermal emission peaks can be associated with specific locations in the structure. Consequently, local periodic heating allows control over which peaks appear in the thermal emission spectrum, as we demonstrate with calculations on two-component metallodielectric structures.
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Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant heat.
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