A terahertz wave all-optical modulator based on quartz-based MAPbI3 thin film

In this work, the terahertz modulation properties of the quartz-based MAPbI 3 thin film were investigated experimentally and theoretically. As can be seen from the experimental results, the terahertz wave transmittance of the MAPbI 3 /SiO 2 sample decreases significantly with the external pump optical power increase, the maximum terahertz modulation depth of the modulator can reach 66.24% at 0.3 THz when the external pump optical power is up to 1500 mW. This work is a further step forward in practical applications of terahertz functional devices, which has good application prospects in the terahertz applied technology field. • We used a simple one-step solution spin-coating method to spin MAPbI 3 film on quartz substrate, and verified the MAPbI 3 thin film by testing XRD, surface morphology and UV–Vis absorption spectra of the MAPbI 3 thin film. • In this work, terahertz wave transmittance of the MAPbI 3 /SiO 2 sample decreases significantly with the external pump optical power increase, the maximum terahertz modulation depth of the modulator can reach 66.24%. • In this work, we analyzed the possible nonlinear two-photon effect in MAPbI 3 thin films, which can well explain the good modulation effect of MAPbI 3 thin films pumped by 1064 nm laser.