HOT SWIR Detector Technology For Both Passive And Active Imaging Applications

Collins Aerospace Princeton, a Raytheon Technologies (RTX) Company, is pushing the boundaries of shortwave infrared (SWIR) sensor performance through advanced photodetector array (PDA) technologies. By leveraging its onshore foundry capabilities, Collins has focused on more than just dark current reduction, introducing innovations that enhance both passive and active imaging applications. Updates to its standard InP-based PIN PDA designs include junction shape refinements, isolation trenches, and novel metallization techniques, which improve hybridization and interconnect yield while reducing costs.

Significant advancements have been made in avalanche photodiodes (APDs) to meet size, weight, power, and noise equivalent irradiance (NEI) performance requirements for active imaging applications. The latest SWIR focal plane arrays (FPAs) support high-speed, large-format detection with improved modulation transfer function (MTF) and lower capacitance, enhancing LiDAR and long-range imaging systems. The development of single-side bumped FPAs further improves operability and cost efficiency.

Additionally, Collins is pioneering in-pixel multimode capabilities, including high-precision time-of-flight (ToF) range-finding, critical for modern targeting and tracking systems. The ongoing development of large-format InP/InGaAs APD-based FPAs aims to address photon-starved, long-range detection needs. By employing a separate absorption, grading, charge, and multiplication (SAGCM) layer structure, Collins has demonstrated superior APD performance with optimized fabrication techniques.

These cutting-edge developments reinforce Collins Aerospace Princeton’s position at the forefront of SWIR imaging and LiDAR technology, delivering industry-leading sensitivity, precision, and reliability for defense, aerospace, and commercial applications.