Next-Generation High-Speed Sensors for 3D Imaging Applications

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The focus of this proposal is to pursue the realization of high-frequency optoelectronic devices for light detection and ranging (LiDAR) systems. LiDAR technology is of importance for aided- and self-driving cars as well as for consumer electronic applications such as smartphones and headsets to enable augmented and virtual reality. Fast and sensitive photodetection is crucial to enable high resolution, accuracy, and detection range. We have recently developed solution-processed ultrafast photodetectors using metal halide perovskites. These outperform existing silicon solution in sensitivity speed. We have also developed colloidal quantum dot photodetectors that extend the sensitivity into the infrared (>1300 nm). This is desired in LiDAR systems to improve eye-safety and improve sensitivity by drastically reducing the limiting background noise from sunlight. The response time of the new photodetectors is faster than 60 ps per pulse, a finding obtained using a loaned 16 GHz oscilloscope. Now we must construct a 3D imaging LiDAR prototype to enable a direct comparison with existing technologies. The lack of a high-frequency oscilloscope in our group is right now precluding further progress. High-frequency characterization is critical to assess the time response of our detectors with the needed resolution to assess rise and fall times as well as ringing effects. These will provide further insights into device and materials limitations and feedback for subsequent steps. Beyond the above, the proposed equipment will help to advance other research programs within our optoelectronic programs. The equipment will provide advanced high-quality training for the next generation of Canadian researchers. We anticipate this equipment will be heavily used by over 90 trainees in the first five years.