title: Tunable wave plate based on active plasmonic metasurfaces.
abstract: Polarization conversion is highly desired for numerous valuable applications such as remote detection and high-precision measurement. It is conventionally achieved through utilizing bulky birefringent crystals or by delicate tailored anisotropy materials. However, such schemes are not compatible with both dynamic and compact on-chip applications. We propose an active metasurface that can generate tunable ellipticity for arbitrary incident polarization with a non-volatile and reversible modulation method. The metasurface consists of V-shape plasmonic antenna arrays and an interval modulation layer made of the phase change material GST for active phase control. Our approach allows the generation of high-quality arbitrary elliptical polarization states in an ultrathin, non-mechanical, and flexible fashion, representing a significant advance compared with its conventional counterparts.
authors.forename: Tianyou
authors.initials: T
authors.lastname: Li
authors.forename: Lingling
authors.initials: L
authors.lastname: Huang
authors.forename: Juan
authors.initials: J
authors.lastname: Liu
authors.forename: Yongtian
authors.initials: Y
authors.lastname: Wang
authors.forename: Thomas
authors.initials: T
authors.lastname: Zentgraf