Advanced SWIR APDs For Multimode Applications

Sensors Unlimited Inc. is advancing short-wave infrared (SWIR) sensor technology by integrating in-pixel multimode capabilities, particularly high-resolution range finding. Precise range-to-target measurements are increasingly vital for modern military and commercial applications, with LiDAR systems now achieving centimeter-level accuracy over kilometer distances. Traditionally, SUI has relied on PIN-based InGaAs detector technology, but recent developments have introduced Avalanche Photodetector (APD) sensors to enhance simultaneous laser tracking, ranging, and imaging.

A key focus of this work is the advancement of Geiger Mode Avalanche Photodetectors (GMAPD), designed to address the size, weight, and power (SWaP) constraints, as well as the noise equivalent irradiance (NEI) challenges in active imaging and tracking systems. SUI presents updates on these developments, including 2D and 3D TCAD simulation results, compared against measured performance data. Additionally, initial findings on GMAPD device improvements and supporting electronics are discussed.

SUI’s revitalized APD technology improves signal-to-noise ratio at the pixel level, enabling more effective readout integrated circuit (ROIC) designs with enhanced performance. These innovations directly respond to the increasing demand for longer-range, high-accuracy imaging systems, reinforcing SUI’s position as a leader in advanced SWIR sensor technology for high-precision targeting and imaging applications.