We propose an innovative design for an integrated, low-loss on-chip terahertz (THz) field detector based on hybrid silicon-organic slot waveguides and THz antennas. We perform a numerical study of the dependency of electro-optic interaction on geometrical parameters to maximize the detector sensitivity. We benchmark it against previously employed plasmonic waveguides which were contended with high plasmonic losses. Our configuration leads to a reduction in the propagation losses of the probe signal by a factor of 5.64, ultimately enabling longer interaction lengths.