Controlling the transmission properties of the terahertz waves in organic/inorganic hybrid holds vast promise for the novel material structure. With optical and electrical excitations, we experimentally demonstrated an active bidirectional amplitude modulation for terahertz consisting of a MEH-PPV/Pedot:Pss/Si/Pedot:Pss multiple structure. In the external optical excitation, transmitted terahertz waves were enhanced when biased with a low positive voltage while attenuated under negative voltage. We obtained a bidirectional trans mission modulation from −54％ to 60％ in the MEH-PPV/Pedot:Pss/Si/Pedot:Pss multiple structure, which exhibits great potential for active broadband terahertz devices.
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