Title

Direction-Controlled Bifunctional Metasurface Polarizers

Abstract

Metasurfaces composed of in-plane subwavelength nanostructures have unprecedented capability in manipulating the amplitude, phase, and polarization states of light. Here, a unique type of direction-controlled bifunctional metasurface polarizer is proposed and experimentally demonstrated based on plasmonic stepped slit-groove dimers. In the forward direction, a chiral linear polarizer is enabled which only allows the transmission of a certain incident handedness and converts it into the specified linear polarization. In the backward direction, the metasurface functions as an anisotropic circular polarizer to selectively convert a certain linear polarization component into the desired circularly polarized transmission. The observed direction-controlled polarization selection and conversion are explained by the spin-dependent mode coupling process inside the bilayer structure. Anisotropic chiral imaging based on the proposed metasurface polarizer is further demonstrated. The results provide new degrees of freedom to realize future multifunctional photonic integrated devices for structured light conversion, vector beam generation, optical imaging and sensing, and optical communication.

Department(s)

Mechanical and Aerospace Engineering

Research Center/Lab(s)

Intelligent Systems Center

Comments

The authors acknowledge support from the Office of Naval Research under Grant No. N00014-16-1-2408, and the National Science Foundation under Grant No. ECCS-1653032 and DMR-1552871. The authors thank the facility support from the Materials Research Center at Missouri S&T.

Keywords and Phrases

Anisotropy; Circular polarization; Degrees of freedom (mechanics); Dichroism; Optical instruments; Plasmonics; 3D fabrication; Asymmetric transmissions; Circularly polarized; Controlled polarization; Metasurfaces; Photonic integrated devices; Polarization conversion; Subwavelength nanostructures; Optical communication; Chiral metasurfaces; Circular dichroism

International Standard Serial Number (ISSN)

1863-8880; 1863-8899

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2018 Wiley-VCH, All rights reserved.

Publication Date

01 Dec 2018

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