Investigation of signal characteristics and charge sharing in AC-LGADs with laser and test beam measurements

Summary: This paper introduces the principles and measurements of Resistive AC-Coupled Silicon Detectors (RSDs), which are based on Low-Gain Avalanche Diode (LGAD) technology and show high spatial and temporal resolutions. By carefully tuning the coupling oxide thickness and n(+) doping profile, RSDs achieve successful operation with signal sharing among multiple read-out pads isotropically. Test results demonstrate spatial resolutions ranging from 2.5 μm to 17 μm and a temporal resolution of approximately 40 ps, showcasing the high performance of RSDs.