Imaging in Short-Wave Infrared with 1.82 μm Pixel Pitch Quantum Dot Image Sensor

Jiwon Lee ¹

Epimitheas Georgitzikis ¹

Yunlong Li ¹

Zhijian Lin ¹

Jihoon Park ¹

Itai Lieberman ¹

David Cheyns ¹

MURALI JAYAPALA ¹

Andy Lambrechts ¹

Steven Thijs ¹

Richard Stahl ¹

Pawel E Malinowski ¹

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Imec,3001,Belgium,Leuven |

Publication type: Proceedings Article

Publication date: 2020-12-12

Institute of Electrical and Electronics Engineers (IEEE)

DOI: 10.1109/IEDM13553.2020.9372018

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Abstract

A high pixel density image sensor for the Short Wave Infrared (SWIR) range is presented. A PbS quantum dot (QD) photodiode array is monolithically integrated on a silicon custom readout IC. Imaging in VIS and SWIR is demonstrated using focal plane arrays with pixel pitch down to record 1.82 μm. Through-silicon vision and lens-free imaging (LFI) microscopy are shown as applications that can benefit from high resolution/small pixel dimensions. In the LFI demonstration, the captured hologram is computationally reconstructed to acquire SWIR microscopic images, resulting in a wavelength equivalent resolution LFI microscopy system. To our knowledge, this is the smallest pitch SWIR pixel ever reported and the first LFI system using a QD image sensor.

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Institute of Electrical and Electronics Engineers (IEEE)