Resonant-cavity enhanced thermal emission
Author(s)Celanovic, Ivan; Perreault, David J.; Kassakian, John G.
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In this paper we present a vertical-cavity enhanced resonant thermal emitter—a highly directional, narrow-band, tunable, partially coherent thermal source. This device enhances thermal emittance of a metallic or any other highly reflective structure to unity near a cavity resonant frequency. The structure consists of a planar metallic surface (e.g., silver, tungsten), a dielectric layer on top of the metal that forms a vertical cavity, followed by a multilayer dielectric stack acting as a partially transparent cavity mirror. The resonant frequency can easily be tuned by changing the cavity thickness (thus shifting resonant emission peak), while the angle at which the maximum emittance appears can be tuned as well by changing the number of dielectric stack layers. The thermal emission exhibits an extremely narrow angular emission lobe, suggesting increased spatial coherence. Furthermore, we show that we can enhance the thermal emission of an arbitrarily low-emittance material, choosing a properly designed thermal cavity, to near unity.
DepartmentMassachusetts Institute of Technology. Institute for Soldier Nanotechnologies; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Laboratory for Electromagnetic and Electronic Systems
Physical Review B
American Physical Society
Celanovic, Ivan, David Perreault, and John Kassakian. “Resonant-Cavity Enhanced Thermal Emission.” Phys. Rev. B 72, no. 7 (August 2005). © 2005 The American Physical Society
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