title: Optically controlled background-free terahertz switching in chiral metamaterial.
abstract: We demonstrate a multiband background-free terahertz (THz) switch in photoactive chiral metamaterial using polarization conversion. Orthogonal arrangement of two asymmetrical split-ring apertures allows a high polarization conversion efficiency and low copolarization transmission. The chiral metamaterial embedded with photoactive silicon promises a dynamic control on cross-polarization transmission and thus enables an efficient background-free THz switch. The on/off state of THz metamaterial switching can be efficiently controlled by an optical pump. The realization of a cross-polarization THz switch provides a new mechanism of mode switching to control THz wave propagation and will be a promising candidate for polarization devices.
authors: T T
authors: TT
authors: Lv
authors: Z
authors: Z
authors: Zhu
authors: J H
authors: JH
authors: Shi
authors: C Y
authors: CY
authors: Guan
authors: Z P
authors: ZP
authors: Wang
authors: T J
authors: TJ
authors: Cui