An organic photodetector for detecting infrared, visible and ultraviolet radiation is provided with a tunable spectral response to achieve a high responsivity at different design wavelengths. The organic photodetector comprises at least a substrate, a first electrode, a second electrode and at least one organic material, which is arranged between the first and the second electrodes, wherein a Schottky barrier is formed at the interface between the first electrode and the organic material and/or between the second electrode and the organic material. The tunability in the responsivity of the organic photodetector is achieved by structuring at least one electrode so that it comprises nano-apertures for exciting surface plasmon resonances.