KEYWORDS: Sensors, Magnetic sensors, Machine vision, Image processing, Artificial intelligence, Video processing, Video microscopy, Video compression, Video, Super resolution
ASELSAN A.S. is not only the largest defense company but also the biggest R&D spender in Türkiye. In line with the company policies on R&D, the R&D Vice Presidency has been founded on Janaury 1st, 2021 with the vision of “Developing advanced and disruptive technologies in the field of ASELSAN activities and to be a pioneer in the global position.”
The main research activities at R&D Vice Presidency includes but not limited to biosensors, sensors, quantum devices, artificial intelligence, communication, photonics, autonomy and advanced materials. This talk will summarize the latest results/developments on these topics.
In this work, the effect of introducing a photonic crystal network of silicon nitride (SiN) micro-domes on the backside of silver coated gallium nitride (GaN) based light emitting diodes (LEDs) was studied. First, sapphire side of the top emitting LEDs, which is the bottom surface of the LEDs, is coated with silver (Ag). Light emitted towards the sapphire substrate is reflected upwards to the top surface and the amount of light extracted from the LED is expected to increase. In an alternative approach, SiN micro-domes forming a two dimensional photonic crystal, 2 μm in diameter and 80 nm in height in average, are deposited on the light emitting surface of the device with a period of 2 μm. Coating the backside with Ag has increased the efficiency of a top emitting LED by 11%. By introducing the SiN photonic crystal onto the Ag backside coated sample, total internal reflection is reduced via scattering and the amount of light emitted has been increased by 30% at 5·104 mA/cm2. Integration of SiN micro-domes with Ag coating has significantly impacted light extraction which has been shown to increase the efficiency of GaN based LEDs. Fabrication process and the results are discussed in detail.
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