High efficiency ambient RF energy harvesting by a metamaterial perfect absorber

We demonstrate a high-efficiency radio frequency (RF) energy harvesting device based on a metamaterial perfect absorber (MPA). With the embedded Schottky diodes, the MPA-based rectenna converts captured RF waves to DC power. The Fabry-Perot (FP) cavity resonance of the MPA greatly improves the amoun...

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Bibliographic Details
Published in:Optical materials express 2022-03, Vol.12 (3), p.1242
Main Authors: Fowler, Clayton, Silva, Sinhara, Thapa, Grija, Zhou, Jiangfeng
Format: Article
Language:English
Subjects:
Absorbers
Absorbers (materials)
Efficiency
Energy conversion efficiency
Energy harvesting
Fabry-Perot interferometers
Metamaterials
Radio frequency
Rectennas
Resonance
Schottky diodes
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Summary:We demonstrate a high-efficiency radio frequency (RF) energy harvesting device based on a metamaterial perfect absorber (MPA). With the embedded Schottky diodes, the MPA-based rectenna converts captured RF waves to DC power. The Fabry-Perot (FP) cavity resonance of the MPA greatly improves the amount of energy captured. Furthermore, the FP resonance exhibits a high Q -factor and significantly increases the voltage across the Schottky diodes, which improves the rectification efficiency, particularly at low intensity. This leads to a factor of 16 improvement of RF-DC conversion efficiency at ambient intensity level. Our MPA-based rectenna can obtain 100 μW power for an incident intensity of 0.4µW/cm 2 .
ISSN:2159-3930
2159-3930
DOI:10.1364/OME.449494