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We demonstrate an ultra-broadband all-optical terahertz modulator based on a semiconductor-integrated hybrid metamaterial. Under photoexcitation using near-infrared laser pulses, the semiconductor regions become highly conducting, causing a transition of the metamaterial from an array of dipole patch grid to a metal wire grating. This transition exhibits dramatically different transmission properties...
We demonstrate ultrathin THz metamaterials capable of high-efficiency and broadband linear polarization conversion in reflection or transmission. Through the creation of a linear phase gradient, they are further employed in the demonstration of near-perfect anomalous reflection/refraction.
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