Microwave demonstration of Purcell effect enhanced radiation efficiency

L. D. Stanfield; A. W. Powell; S. A. R. Horsley; J. R. Sambles; A. P. Hibbins

doi:10.1038/s41598-023-32066-w

Scientific Reports (Mar 2023)

Microwave demonstration of Purcell effect enhanced radiation efficiency

L. D. Stanfield,
A. W. Powell,
S. A. R. Horsley,
J. R. Sambles,
A. P. Hibbins

Affiliations

L. D. Stanfield: Department of Physics and Astronomy, University of Exeter
A. W. Powell: Department of Physics and Astronomy, University of Exeter
S. A. R. Horsley: Department of Physics and Astronomy, University of Exeter
J. R. Sambles: Department of Physics and Astronomy, University of Exeter
A. P. Hibbins: Department of Physics and Astronomy, University of Exeter

DOI: https://doi.org/10.1038/s41598-023-32066-w
Journal volume & issue: Vol. 13, no. 1
pp. 1 – 7

Abstract

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Abstract We experimentally demonstrate a Purcell effect-based design technique for improved impedance matching, and thus enhanced the reflection coefficient from a small microwave emitter. Using an iterative process centred on comparing the phase of the radiated field of the emitter in air with that of the emitter in a dielectric environment, we optimise the structure of a dielectric hemisphere above a ground plane surrounding a small monopolar microwave emitter in order to maximise its radiation efficiency. The optimised system shows very strong coupling between the emitter and two omnidirectional radiation modes at 1.99 GHz and 2.84 GHz, yielding Purcell enhancement factors of 1762 and 411 times increase respectively, and near perfect radiation efficiency.

Published in Scientific Reports

ISSN: 2045-2322 (Online)
Publisher: Nature Portfolio
Country of publisher: United Kingdom
LCC subjects: Medicine; Science
Website: https://www.nature.com/srep/

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