title: High-efficiency tri-band quasi-continuous phase gradient metamaterials based on spoof surface plasmon polaritons.
abstract: A high-efficiency tri-band quasi-continuous phase gradient metamaterial is designed and demonstrated based on spoof surface plasmon polaritons (SSPPs). High-efficiency polarizaiton conversion transmission is firstly achieved via tailoring phase differece between the transmisive SSPP and the space wave in orthogonal directions. As an example, a tri-band circular-to-circular (CTC) polarization conversion metamateiral (PCM) was designed by a nonlinearly dispersive phase difference. Using such PCM unit cell, a tri-band quasi-continuous phase gradient metamaterial (PGM) was then realized by virtue of the Pancharatnam-Berry phase. The distribution of the cross-polarization transmission phase along the x-direction is continuous except for two infinitely small intervals near the phases 0° and 360°, and thus the phase gradient has definition at any point along the x-direction. The simulated normalized polarization conversion transmission spectrums together with the electric field distributions for circularly polarized wave and linearly polarized wave demonstrated the high-efficiency anomalous refraction of the quasi-continuous PGM. The experimental verification for the linearly polarized incidence was also provided.
authors.affiliation: College of Science, Air Force Engineering University, Xi,an 710051, People's Republic of China.
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Li
authors.affiliation: College of Science, Air Force Engineering University, Xi,an 710051, People's Republic of China.
authors.forename: Hua
authors.initials: H
authors.lastname: Ma
authors.affiliation: College of Science, Air Force Engineering University, Xi,an 710051, People's Republic of China.
authors.forename: Jiafu
authors.initials: J
authors.lastname: Wang
authors.affiliation: College of Science, Air Force Engineering University, Xi,an 710051, People's Republic of China.
authors.forename: Yongqiang
authors.initials: Y
authors.lastname: Pang
authors.affiliation: College of Science, Air Force Engineering University, Xi,an 710051, People's Republic of China.
authors.forename: Qiqi
authors.initials: Q
authors.lastname: Zheng
authors.affiliation: College of Science, Air Force Engineering University, Xi,an 710051, People's Republic of China.
authors.forename: Hongya
authors.initials: H
authors.lastname: Chen
authors.affiliation: College of Science, Air Force Engineering University, Xi,an 710051, People's Republic of China.
authors.forename: Yajuan
authors.initials: Y
authors.lastname: Han
authors.affiliation: College of Science, Air Force Engineering University, Xi,an 710051, People's Republic of China.
authors.forename: Jieqiu
authors.initials: J
authors.lastname: Zhang
authors.affiliation: College of Science, Air Force Engineering University, Xi,an 710051, People's Republic of China.
authors.forename: Shaobo
authors.initials: S
authors.lastname: Qu