Publication date: 3rd July 2020
Active imaging is an infrared mode of imaging where an eye invisible source is used to illuminate a scene and the scattered light is collected on a sensor. Such applications used for industrial vision or LIDAR detection requires an infrared source and a detector. These latters typically operate in the short wave infrared (1-3 µm range).
Here i will review different steps of progress required to achieve nanocrystal based infrared active imaging.
I will start with recent progresses relative to HgTe nanocrystal growth using liquid mercury and enabling mass scale and greener synthetic route for this material. [1]
Compared to conventional epitaxially grown semiconductor, nanocrystals consideraly ease the coupling to the read out circuit and i will discuss how conductive ink can be deposited to obtain a large absorption from VGA format focal plane array. [2]
In the last part, i will discuss progresses obtained on the source side. While HgTe appears as a versatile platform for detection, its use for electroluminescence remains limited. I will present some new results in this direction and show that the obtained LED is compatible with application such as moisture detection.
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