Abstract
Manipulating circularly polarized (CP) electromagnetic waves as desired is important for a wide range of applications ranging from chiral-molecule manipulations to optical communication, but conventional natural-materials-based devices suffer from bulky configuration and low efficiencies. Recently, Pancharatnam–Berry (PB) metasurfaces have demonstrated strong capabilities to control CP waves in different frequency domains. In this article, we present a concise review on PB metasurfaces for CP light manipulations, focusing mainly on the research works done by our own group. After briefly introducing the working principles of PB metasurfaces, we separately discuss how to construct high-efficiency PB metasurfaces in reflection and transmission geometries, and how to utilize them to control CP waves in different frequency domains, including meta-lensing, meta-hologram, and surface couplers. Finally, we conclude this review with our perspectives on future developments of PB metasurfaces.
Highlights
The arbitrary control on electromagnetic (EM) wave is always highly desired, due to the importance in fundamental sciences, and for versatile real applications in different areas, such as information communications, national defenses, and energy explorations
We present a short review on PB metasurfaces, focusing mainly on the work done in our own group
After briefly introducing the working principles of PB metasurfaces, we present the general criterions that we have discovered to design 100%-efficiency PB metasurfaces in both reflection and transmission geometries, which are the crucial steps to overcome the low-efficiency issues persisting in many PB metasurfaces realized in early years
Summary
The arbitrary control on electromagnetic (EM) wave is always highly desired, due to the importance in fundamental sciences, and for versatile real applications in different areas, such as information communications, national defenses, and energy explorations. Inevitable losses and fabrication complexities, especially in high frequency regimes These issues significantly hinder the further developments and practical applications of MTMs. Metasurfaces, ultrathin MTMs consisting of planar subwavelength units with tailored EM responses arranged in some specific global orders, offer a more advanced platform to overcome the issues faced by devices made by both natural and MTMs. In contrast to MTMs relying on propagation phases inside the bulk media, metasurfaces fully explore the abrupt phase changes of EM waves at meta-atom interfaces to form certain predetermined phase and/or amplitude distributions on the device surfaces, enabling diversified fascinating wave-manipulation effects with much better performances than those realized with MTMs [7,8,9,10,11,12], including light bending [13,14,15], meta-lensing [16,17,18], propagating wave to surface wave conversion [14, 19, 20], and vector beam generations [7,8,9,10,11, 13, 14, 21,22,23]. We conclude this review with our own perspectives on possible future directions of this fast-developing sub-brand of metasurfaces
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