Full-Space Spin-Controlled Four-Channel Metalens With Equal Power Distribution and Broad Bandwidth

IF 9.8 1区 物理与天体物理 Q1 OPTICS
Xiaoluo He, Bowen Ren, Ka Fai Chan, Alex M. H. Wong
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引用次数: 0

Abstract

A novel method is proposed to achieve a multifunctional full-space metalens supporting high power efficiency, broadband operation and large design flexibility for four spin-controlled output channels. A full-space meta-atom comprising an ultra-thin printed circuit board layer and a low-cost 3D-printed dielectric block are introduced. This meta-atom combines the geometric and propagation phase phenomena to divide an incident circularly-polarized wave into four equi-powered output channels (left- and right-polarized reflected waves and left- and right-polarized transmitted waves). The output waveforms can be stipulated with large flexibility by tuning the meta-atoms. The usage of non-resonant phase-tuning mechanisms allows the resultant metalenses to be broadband and power efficient. Two full-space metalenses are demonstrated using this unit cell, where the four output channels carry different combinations of orbital angular momenta and focal lengths. Simulation and experimental results show that, over a broad bandwidth of 50–70 GHz (33%$\%$), all channels realize the pre-designed functionalities with high mode purities and achieve an average power efficiency of 90%$\%$. Compared to previous multifunctional metalenses, these metalenses offer the simultaneous achievement of full-space operation, spin-decoupled manipulation, high-efficiency and a broad working bandwidth, opening new opportunities for millimeter-wave imaging and communication systems.

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来源期刊
CiteScore
14.20
自引率
5.50%
发文量
314
审稿时长
2 months
期刊介绍: Laser & Photonics Reviews is a reputable journal that publishes high-quality Reviews, original Research Articles, and Perspectives in the field of photonics and optics. It covers both theoretical and experimental aspects, including recent groundbreaking research, specific advancements, and innovative applications. As evidence of its impact and recognition, Laser & Photonics Reviews boasts a remarkable 2022 Impact Factor of 11.0, according to the Journal Citation Reports from Clarivate Analytics (2023). Moreover, it holds impressive rankings in the InCites Journal Citation Reports: in 2021, it was ranked 6th out of 101 in the field of Optics, 15th out of 161 in Applied Physics, and 12th out of 69 in Condensed Matter Physics. The journal uses the ISSN numbers 1863-8880 for print and 1863-8899 for online publications.
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