If a material absorbs light, it will heat up. That heat must go somewhere, and the ability to control where and how much heat is emitted can protect or even hide such devices as satellites. An international team of researchers has published a novel method for controlling this thermal emission in Science.
If a material absorbs light, it will heat up. That heat must go somewhere, and the ability to control where and how much heat is emitted can protect or even hide such devices as satellites. An international team of researchers, including those from Penn State, has developed a novel method for controlling this thermal emission, with what they called promising implications for thermal management and thermal camouflage technologies.
Getting to this point, though, was not straightforward, according to Ozdemir. He explained part of the issue is limiting the perfect thermal absorber-emitter to the interface while the rest of the structures forming the platform remains"cold," meaning those structures do not absorb or emit any form of energy.
The researchers can adjust the thickness of the platinum layer as needed to induce the critical coupling condition at the stitched interface and trap incoming light to be perfectly absorbed. They also can move the system away from the critical coupling to sub- or super-critical coupling, where perfect absorption and emission cannot take place.
"Every hot object radiates heat in the form of incoherent, random light," Rotter said."Traditionally, it has been believed that thermal radiation cannot have topological properties because of its incoherent nature." "This can be as simple as creating a film divided into two regions with different thicknesses such that one side satisfies sub-critical coupling, and the other is in the super-critical coupling regime, dividing the system into two different topological classes," Kocabas said.
The European Research Council, Consolidator Grant, the Air Force Office of Scientific Research Multidisciplinary University Research Initiative Award on Programmable Systems with Non-Hermitian Quantum Dynamics and the Air Force Office of Scientific Research Award supported this work.M. Said Ergoktas, Ali Kecebas, Konstantinos Despotelis, Sina Soleymani, Gokhan Bakan, Askin Kocabas, Alessandro Principi, Stefan Rotter, Sahin K. Ozdemir, Coskun Kocabas.
Cosmic Rays Astronomy Sun Optics Inorganic Chemistry Chemistry Thermodynamics
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