Abstract:In recent years, the use of artificially designed metasurface of metallic arrays to achieve modulation of terahertz wave has received increasing attention. Two complementary metasurfaces of gold subwavelength structure array are proposed. Both of two metasurfaces, positive and negative structures, have resonance responses to terahertz wave. The optical control terahertz time-domain spectrum system is utilized to measure the spectral modulation of the terahertz wave by controlling the pump light. With pump light of 28 mW, the negative structure metasurface can have an amplitude modulation depth up to 95% at 0.91 THz. The amplitude holography is further designed by using this negative structure metasurface to modulate the terahertz wavefront. The simulation result demonstrates the feasibility of the proposed method. This approach can achieve dynamic modulation of terahertz wave, which is of great significance to the development of terahertz dynamic adjustable function devices.