Realization of high efficiency ultrasound-powered micro-LEDs for optogenetics

Tanmay Mondal; Kjeld Laursen; Seyedsina Hosseini; Amin Rashidi; Farshad Moradi; Brian Corbett

doi:10.1117/12.2555762

2 April 2020 Realization of high efficiency ultrasound-powered micro-LEDs for optogenetics

Tanmay Mondal, Kjeld Laursen, Seyedsina Hosseini, Amin Rashidi, Farshad Moradi, Brian Corbett

Proceedings Volume 11364, Integrated Photonics Platforms: Fundamental Research, Manufacturing and Applications; 113641I (2020) https://doi.org/10.1117/12.2555762
Event: SPIE Photonics Europe, 2020, Online Only

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.

Conference Presentation

Citation Download Citation

Tanmay Mondal, Kjeld Laursen, Seyedsina Hosseini, Amin Rashidi, Farshad Moradi, and Brian Corbett "Realization of high efficiency ultrasound-powered micro-LEDs for optogenetics", Proc. SPIE 11364, Integrated Photonics Platforms: Fundamental Research, Manufacturing and Applications, 113641I (2 April 2020); https://doi.org/10.1117/12.2555762

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