Abstract
We theoretically demonstrate a resonant modulation of THz waves with photo-designed metasurfaces. Our approach bypasses the issue of the short penetration length of the optical pump which prevents to photogenerate thick metamaterials. We propose a three layers semiconductor system of subwavelength thickness that presents a 100% modulation of the reflection (or absorption) spectra around 1 THz when it is optically actuated. This resonant modulation can be dynamically monitored at high frequency rate by the optical pump on broad range of frequencies of Δν/ν = 100%. Finally, appropriate 2D photo-printed patterns make the system polarization insensitive and operational for a wide range of incident angles up to 65° .