Optical neuron stimulation arrays are important for both in-vitro biology and retinal prosthetic biomedical applications. Hence, in this work, we present an 8100 pixel high radiance photonic stimulator. The chip module vertically combines custom made gallium nitride μ LEDs with a CMOS application specific integrated circuit. This is designed with active pixels to ensure random access and to allow continuous illumination of all required pixels. The μLEDs have been assembled on the chip using a solder ball flip-chip bonding technique which has allowed for reliable and repeatable manufacture. We have evaluated the performance of the matrix by measuring the different factors including the static, dynamic power consumption, the illumination, and the current consumption by each LED. We show that the power consumption is within a range suitable for portable use. Finally, the thermal behavior of the matrix is monitored and the matrix proved to be thermally stable.
InGaN-based micro-light-emitting diodes (µ-LEDs) emitting at 470 nm and composed of micropixels each with controlled shaping achieves directed light output with an angular full width at half maximum of 48°. The reflected light from the mesa sidewalls is azimuthally polarized. The small signal bandwidth of an individual µ-LED is >500 MHz. A cluster of 14 µ-LEDs is used to achieve a large signal data transfer rate of 500 Mbps in a form which is compatible with communication over plastic optical fibre.
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