Fundamentals and applications of spin-decoupled Pancharatnam—Berry metasurfaces

Yingcheng Qiu, Shiwei Tang*, Tong Cai, Hexiu Xu, Fei Ding

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Manipulating circularly polarized (CP) electromagnetic (EM) waves at will is significantly important for a wide range of applications ranging from chiral-molecule manipulations to optical communication. However, conventional EM devices based on natural materials suffer from limited functionalities, bulky configurations, and low efficiencies. Recently, Pancharatnam-Berry (PB) phase metasurfaces have shown excellent capabilities in controlling CP waves in different frequency domains, thereby allowing for multi-functional PB meta-devices that integrate distinct functionalities into single and flat devices. Nevertheless, the PB phase has intrinsically opposite signs for two spins, resulting in locked and mirrored functionalities for right CP and left CP beams. Here we review the fundamentals and applications of spin-decoupled metasurfaces that release the spin-locked limitation of PB metasurfaces by combining the orientation-dependent PB phase and the dimension-dependent propagation phase. This provides a general and practical guideline toward realizing spin-decoupled functionalities with a single metasurface for orthogonal circular polarizations. Finally, we conclude this review with a short conclusion and personal outlook on the future directions of this rapidly growing research area, hoping to stimulate new research outputs that can be useful in future applications.

Original languageEnglish
JournalFrontiers of Optoelectronics
Volume14
Issue number2
Pages (from-to)134-147
ISSN2095-2767
DOIs
Publication statusPublished - Jun 2021

Bibliographical note

Publisher Copyright:
© 2021, Higher Education Press.

Keywords

  • Pancharatnam-Berry (PB) metasurfaces
  • spin-decoupled

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