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Materials 2018, 11(1), 153;

GaN-Based Laser Wireless Power Transfer System

Department of Information Engineering, University of Padova, via Gradenigo 6B, 35131 Padova, Italy
Centro Giorgio Levi Cases, University of Padova, via Marzolo 9, 35131 Padova, Italy
Institut d’Electronique, de Microélectronique et de Nanotechnologie, Centre National de la Recherche Scientifique (IEMN-CNRS), Avenue Poincaré CS 60069, 59652 Villeneuve d’Ascq, France
Department of Physics and Astronomy, University of Padova, via Marzolo 8, 35131 Padova, Italy
Author to whom correspondence should be addressed.
Received: 25 November 2017 / Revised: 9 January 2018 / Accepted: 10 January 2018 / Published: 17 January 2018
(This article belongs to the Special Issue Light Emitting Diodes and Laser Diodes: Materials and Devices)
PDF [3813 KB, uploaded 17 January 2018]


The aim of this work is to present a potential application of gallium nitride-based optoelectronic devices. By using a laser diode and a photodetector, we designed and demonstrated a free-space compact and lightweight wireless power transfer system, whose efficiency is limited by the efficiency of the receiver. We analyzed the effect of the electrical load, temperature, partial absorption and optical excitation distribution on the efficiency, by identifying heating and band-filling as the most impactful processes. By comparing the final demonstrator with a commercial RF-based Qi system, we conclude that the efficiency is still low at close range, but is promising in medium to long range applications. Efficiency may not be a limiting factor, since this concept can enable entirely new possibilities and designs, especially relevant for space applications. View Full-Text
Keywords: laser diode; photodetector; wireless power transfer laser diode; photodetector; wireless power transfer

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De Santi, C.; Meneghini, M.; Caria, A.; Dogmus, E.; Zegaoui, M.; Medjdoub, F.; Kalinic, B.; Cesca, T.; Meneghesso, G.; Zanoni, E. GaN-Based Laser Wireless Power Transfer System. Materials 2018, 11, 153.

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