Fig. 1. Schematic diagram of simulation model and circuit

Fig. 2. Comparison of photocurrent output under different beam widths

Fig. 3. Comparison of photocurrent amplitude under front and back illumination with different substrate thicknesses

Fig. 4. Typical simulation waveforms under front and back illumination with a 10 kW peak optical power and equivalent circuit of planar devices

Fig. 5. Schematic diagram of current distribution inside the device

Fig. 6. Comparison of surface current density and electric field intensity in devices

Fig. 7. Schematic diagram of the test device and the experimental platform

Fig. 8. Comparison of output amplitude and typical waveform