期刊论文

Xu, He-Xiu

英文

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION

0018-926X

2017

65

12

7378-7382

10.1109/TAP.2017.2761548

10.13039/501100001809-National Natural Science Foundation of China (Grant Number: 61501499) 10.13039/501100007128-Natural Science Foundation of Shaanxi Province (Grant Number: 2016JQ6001) National Defense Foundation of China (Grant Number: 2201078) Innovative Talents Cultivate Program of Shaanxi Province (Grant Number: 2017KJXX-24) Aviation Science Foundation of China (Grant Number: 20161996009)

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Vortex beams have been extensively realized using different approaches. Typically, the efficiency and bandwidth of a vortex beam are limited by impure copolarized components and the intrinsic dispersion of passive resonant structures. Here, we propose a strategy to generate wideband vortex beams by using a Pancharatnam-Berry metasurface in which two orthogonal reflections exhibit a broadband out-of-phase difference. To achieve this, a broadband strategy based on multimode operation and dispersion engineering methods was established. A dual-laye...