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Abstract
In this paper, an active terahertz modulator based on optically controlled organometal halide perovskite ${\rm{MAPb}}{{\rm{I}}_2}{\rm{Br}}$ is proposed. The terahertz wave time-domain transmission of the ${\rm{MAPb}}{{\rm{I}}_2}{\rm{Br}}/{\rm{A}}{{\rm{l}}_2}{{\rm{O}}_3}$ sample was measured by a terahertz time-domain spectrometer. Experimental results indicate that the ${\rm{MAPb}}{{\rm{I}}_2}{\rm{Br}}/{\rm{A}}{{\rm{l}}_2}{{\rm{O}}_3}$ sample showed an obvious optical-power-dependent modulation effect on transmission of the terahertz wave; the maximum modulation depth of the modulator can reach 59.99% at 0.3 THz when the external pump optical power is up to 1500 mW.
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