Breaking the black-body limit with resonant surfaces
Department of Physics, School of Science and Technology, Nazarbayev University, KZ-010000
2 Department of Radio Science and Engineering, School of Electrical Engineering, Aalto University, P.O. Box 13000, Aalto FI-00076, Finland
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Accepted: 15 January 2017
Published online: 15 February 2017
The speed with which electromagnetic energy can be wirelessly transferred from a source to the user is a crucial indicator for the performance of a large number of electronic and photonic devices. We expect that energy transfer can be enhanced using special materials. In this paper, we determine the constituent parameters of a medium which can support theoretically infinite energy concentration close to its boundary; such a material combines properties of Perfectly Matched Layers (PML) and Double-Negative (DNG) media. It realizes conjugate matching with free space for every possible mode including, most importantly, all evanescent modes; we call this medium Conjugate Matched Layer (CML). Sources located outside such layer deliver power to the conjugate-matched body exceptionally effectively, impressively overcoming the black-body absorption limit which takes into account only propagating waves. We also expand this near-field concept related to the infinitely fast absorption of energy along the air-medium interface to enhance the far-field radiation. This becomes possible with the use of small particles randomly placed along the boundary; the induced currents due to the extremely high-amplitude resonating fields can play the role of emission “vessels”, by sending part of the theoretically unlimited near-field energy far away from the CML structure.
Key words: Black-body limit / Conjugate matching / Perfectly Matched Layer (PML) / Wireless power transfer
© C.A. Valagiannopoulos et al., Published by EDP Sciences, 2017
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