光学
透射率
物理
材料科学
介电常数
角动量
超材料
微波食品加热
发电机(电路理论)
谐振器
梁(结构)
涡流
涡流发生器
几何相位
电介质
光电子学
热力学
功率(物理)
量子力学
作者
Shiwei Tang,Tong Cai,Jian‐Gang Liang,Xiaomei Yu,Chengwu Zhang,Qing Zhang,Ziyang Hu,Tao Jiang
出处
期刊:Optics Express
[The Optical Society]
日期:2019-01-22
卷期号:27 (3): 1816-1816
被引量:29
摘要
Vortex beam generators are promising to improve the transmission data rate and enlarge the communication capacity due to the fact that they inherently carry the orbital angular momentum (OAM). However, current available devices are limited because of high profiles and low efficiencies, especially for the transmissive case. Here, we propose a new strategy to design an ultrathin (0.07λ0) transmissive Pancharatnam-Berry (PB) metasurface with nearly unit transmittance. The carefully optimized metasurface integrates an anisotropic crossbar structure with positive permittivity and a holey metallic ring resonator with negative permittivity based on certain criterions placed on both sides of a dielectric substrate, which realize an exact π phase difference due to the control of permittivities at both polarizations. As a proof of concept, a microwave vortex beam generator is designed, fabricated and experimentally characterized. Both measured far-field and near-field characterizations are in excellent agreement with numerical simulations, indicating that our transmissive PB meta-device (operating at 10.6 GHz) exhibits a maximum experimental efficiency of 87%. Our findings can motivate the realizations of high-performance transmissive PB meta-devices with a very low profile or operation at other frequency domains.
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