Dr. Husain A. Naqi Profile

Dr. Husain A. Naqi

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Proceedings Article | 30 September 2022 Presentation + Paper

Near-infrared QW LED spectroscopy for viral infections detection and analysis

Abdullah Zakariya, Husain Naqi

Proceedings Volume 12234, 1223402 (2022) https://doi.org/10.1117/12.2632714

KEYWORDS: Light emitting diodes, Quantum wells, Spectroscopy, Near infrared spectroscopy, Biological research, Near infrared, Infrared radiation, Electroluminescence, Chemical analysis, Statistical analysis

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We propose a monolithic broad multi-wavelength NIR LED device to function as a main analysis and viral infections detection component in clinical biology testing equipment. Area selective Quantum Well Intermixing (QWI) is used to produce miniature size LEDs on a single QW substrate. In this research, SiO2 layers that range between 0nm to 400nm with a 50nm thickness steps over separated regions are deposited to create eight regions of different bandgaps. The thicker the diffusion layer the larger the blue shift. Consequently, eight LEDs that emit light in eight different wavelengths each with its individual contact pad are fabricated. Each LED emits a specific wavelength individually that corresponds to the thickness of the deposited SiO2 layer by injecting electrical current into its contact pad and light emission is collected at a single output. As a result, the device can produce light from a single or multiple LEDs simultaneously. For our research, a simultaneous current injection into all LEDs is required to produce a broad infrared light. The LEDs electroluminescence when current is injected at 37mA results in eight wavelengths of: 797,804, 810, 816, 823, 831, 837, 850nm with an average LED responsivity of ~0.4W/A. A calculated average of the optical output shows a broad infrared spectrum from a single structure that can be easily integrated into modern biological analytical tools.

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