Characterization and modelling of signal dynamics in 3D-DDTC detectors

In the past few years we have developed 3D detector technologies within a collaboration between INFN and FBK-irst aiming at a simplification of the fabrication technology with respect to the original 3D design. These detectors are the object of an increasing interest from the HEP community because of their intrinsic radiation hardness, making them appealing for innermost layers of tracking at the foreseen upgrades of the large hadron collider. In this paper we evaluate the signal shape in response to localized and uniform charge deposition both by solving Ramoʹs theorem and with the aid of TCAD simulations. Signals observed in 3D diodes, stimulated by lasers at different wavelengths, are compared with simulations results.