Realization of high efficiency ultrasound-powered micro-LEDs for optogenetics
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Published Version
Date
2020-04-02
Authors
Mondal, Tanmay
Laursen, Kjeld
Hosseini, Seyedsina
Rashidi, Amin
Moradi, Farshad
Corbett, Brian
Journal Title
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Volume Title
Publisher
Society of Photo-Optical Instrumentation Engineers (SPIE)
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Abstract
We present the fabrication, characterization, and demonstration of high-efficiency ultrasound-powered micro- light emitting diodes (μLED) for use in optogenetic applications. InGaN based blue-emitting LED material wafers grown on a patterned sapphire substrate (PSS) were used to assist in the out-scattering of the light. The turn-on voltage of the LEDs is around 2.5 volts and the electrical ideality factor is 1.2 confirming high radiative recombination efficiency. A power density of more than 50 mW/mm2 was obtained from a 130 x 300 μm2 LED with a mesa of 100 μm diameter at 3 mA which is much more than is required to excite channelrhodopsin transfected neural cells. A high external quantum efficiency (EQE) of 33% is obtained at 3 mA measured in an integrating sphere. The peak wavelength of the μLED was measured at 483 nm at different current densities. The μLEDs are integrated directly onto a rectifier and Piezoelectric Transducer (PZT) harvester to realise a highly efficient ultrasound-powered light delivery unit capable to generate mWs of optical power. The concept was validated by powering the integrated device with ultrasound.
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Keywords
Efficiency , Implantable device , Optogenetics , Ultrasound powering , PZT , Rectifier , μLED
Citation
Mondal, T., Laursen, K., Hosseini, S., Rashidi, A., Moradi, F. and Corbett, B. (2020) 'Realization of high efficiency ultrasound-powered micro-LEDs for optogenetics', SPIE Photonics Europe, Strasbourg, France, 29 March - 2 April, Proceedings of SPIE, Volume 11364: Integrated Photonics Platforms: Fundamental Research, Manufacturing and Applications, 113641I (8pp) doi: 10.1117/12.2555762
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© 2020, Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.