Centimeter-sized Photon-Sensing Integrated Circuit (PSIC) Detector and Receiver for Lidars at 475nm Wavelength

Lidar operates as a pair of synchronized photon emitter and receiver, where the receiver detects the emitted photons reflected from the target. The photon emission is temporally modulated into pulses, and the receiver detects the temporal modulation in the reflected photons and derives target range information, similar to the radar. The most common temporal modulation in lidars is by laser pulses and synchronized time-of-flight range detection. The detection range is limited by the power of the photon source, optical aperture size and receiver sensitivity. The detection dynamic range (DR) must be very high to simultaneously accommodate reflections from targets near and far. The proposed uncooled Photon-Sensing Integrated Circuit (PSIC) is an ultra-high-sensitivity, low-noise, high-DR and time-gated photodetector for 475nm lidars. Having proven the concept during Phase I, we plan to prototype and deliver during Phase II the proposed uncooled, centimeter-sized, ultra-high-sensitivity, low-noise, high-DR, time-gated PSIC photodetector and receiver for 475nm lidars. Continuing from Phase I, we will (i) iteratively optimize, fabricate and characterize the PSIC of enhanced performance for photon-starved, high-DR and time-gated sensing in the 475nm spectral band, (ii) integrate with commercial-off-the-shelf trans-impedance amplifier, and (iii) deliver the integrated PSIC receiver to DoD during Phase II.