Paper 12568-17
Paper 12568-17
Light beaming and outcoupling enhancement from quantum wells with Al metasurfaces
On demand | Presented live 27 April 2023 
Abstract
The emission pattern of Light-Emitting Diodes (LEDs) is Lambertian, which requires secondary optics to improve directionality. In addition, Gallium Nitride (GaN) based LEDs and micro-LEDs (μLEDs) have low outcoupling efficiency due to the high refractive index difference between air and GaN. Here, we experimentally investigate the impact of introducing a simple design of aluminum (Al) nanoparticles arrays (metasurfaces) to control the far-field emission of InGaN green emitting quantum wells (MQWs). This tailoring of emission originates from the near-field coupling between the InGaN MQWs and the resonant nanoparticles. Fourier microscopy measurements reveal that the period of the Al array controls the angular photoluminescence (PL) emission pattern. Furthermore, we obtain a five-fold enhancement of the collected outcoupled light intensity by implementing Al metasurfaces to the InGaN MQWs.
Presenter
Mohamed Mahmoud Saad Abdelkhalik Mohamed
Technische Univ. Eindhoven (Netherlands)
Before joining the group Surface Photonics at Eindhoven University of Technology (Netherlands) as a Ph.D. student in November 2019, I received my master's degree in Optics & Photonics from Karlsruhe Institute of Technology (Germany). In addition, I completed my master’s thesis in the OMEGA Lab KAUST (Saudi Arabia) where I optimized transparent top electrodes for transparent organic photovoltaics. My current research mainly focuses on integrating nanophotonics in commercial LEDs to achieve ultra-high brightness and compact LEDs, the project in close cooperation with Lumileds Holding B.V.