Breaking the black-body limit with resonant surfaces

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openAccess CC BY

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2017

Department

Department of Radio Science and Engineering
Department of Electronics and Nanoengineering

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Mcode

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Language

en

Pages

6

Series

EPJ Applied Metamaterials, Volume 4

Abstract

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.

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Keywords

Black-body limit, Conjugate matching, Perfectly Matched Layer (PML), Wireless power transfer

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DOI

10.1051/epjam/2017002

Citation

Valagiannopoulos, C A, Simovski, C R & Tretyakov, S A 2017, ' Breaking the black-body limit with resonant surfaces ', EPJ Applied Metamaterials, vol. 4, 5 . https://doi.org/10.1051/epjam/2017002

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https://urn.fi/URN:NBN:fi:aalto-201710137003

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[article-cris] Sähkötekniikan korkeakoulu / ELEC