Imaging in Short-Wave Infrared with 1.82 μm Pixel Pitch Quantum Dot Image Sensor
Jiwon Lee, Epimitheas Georgitzikis, Yunlong Li, Ziduo Lin, Ji Hoon Park, Itai Lieberman, David Cheyns, Murali Jayapala, Andy Lambrechts, S. Thijs, Richard Stahl, Paweł E. Malinowski
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.