Fig. 1. Structure diagram of photoconductive switch. (a) Schematic diagram; (b) physical map

Fig. 2. Lumped circuit model of photoconductive switch

Fig. 3. Principle of rectangular pulse sampling. (a) Time-domain waveform of signal to be sampled; (b) time-domain waveform of rectangular pulse sampling signal; (c) waveform multiplied in the time-domain of rectangular pulse sampling; (d) spectrum of the signal to be sampled; (e) spectrum of the sampled rectangular pulse signal; (f) spectrum of the final output signal after convolution in the frequency domain

Fig. 4. Simulation results of switch S₂₁ parameter

Fig. 5. Schematic of RF signal transmission performance test

Fig. 6. Electrical transmission performance in dark and light. (a) Three interdigital electrodes; (b) two interdigital electrodes

Fig. 7. Effect of input optical power on on-off ratio

Fig. 8. Experimental photoconductive sampling system

Fig. 9. Spectrum after sampling. (a) Raw chip; (b) chip with nitrogen ion implantation

Table 1. Theoretical and measured values of the mapping frequency of different Nyquist intervals

Table 2. Input optical power corresponds to output spectral amplitude