Abstract: Disclosed herein is a detector (110) for an optical detection of at least one object (112) the detector (110) including: (a) at least one longitudinal optical sensor (114) having at least one sensor region (130), the longitudinal optical sensor (114) containing at least one photodiode (134) the photodiode (134) having at least two electrodes (166, 174), wherein at least one photoactive layer (180) containing at least one electron donor material and at least one electron acceptor material is embedded between the electrodes (166, 174); and (b) at least one evaluation device (150) designed to generate at least one item of information on a longitudinal position of the object (112) by evaluating the longitudinal sensor signal. The detector (110) is efficient for accurately determining of a position of at least one object (112) in space, and exhibits an FiP effect with an improved signal-to-noise ratio.