Fig. 1. （a）Three-dimensional model for the synthesis of Ag NPs/CDs under UV illumination，（b）particle size distribution map corresponding to Ag NPs nanoparticles，（c）TEM map of Ag NPs/CDs，（d）particle size distribution map corresponding to CDs nanoparticles

Fig. 2. （a）UV-Vis absorption spectra of Ag NPs/CDs compared with CDs and Ag NPs，（b）corresponding solutions of CDs（left）and Ag NPs/CDs（right），（c）structure model of Ag NPs/CDs modulator，（d）electric field distribution of Ag NPs/CDs modulator under near infrared irradiation at 808 nm

Fig. 3. （a）The schematic diagram of terahertz experiments with 808 nm laser modulation of Ag NPs/CDs modulator，terahertz wave transmission under laser radiation modulation with different powers，（b）reference silicon wafer and（c）normalized terahertz wave transmission of Ag NPs/CDs modulator

Fig. 4. （a）Normalized transmittance and（b）modulation depth of terahertz pulses through a reference silicon substrate and Ag NPs/CDs modulator under different power laser irradiations