Transparent Dielectric Metasurfaces for Spatial Mode Multiplexing

Sergey Kruk; Filipe Ferreira; Naoise Mac Suibhne; Christos Tsekrekos; Ivan Kravchenko; Andrew Ellis; Dragomir Neshev; Sergey Turitsyn; Yuri Kivshar

doi:10.1002/lpor.201800031

Transparent Dielectric Metasurfaces for Spatial Mode Multiplexing

Sergey Kruk, Filipe Ferreira, Naoise Mac Suibhne, Christos Tsekrekos, Ivan Kravchenko, Andrew Ellis, Dragomir Neshev, Sergey Turitsyn, Yuri Kivshar

Nanofabrication Research Laboratory

Research output: Contribution to journal › Letter › peer-review

42 Scopus citations

Abstract

Expanding the use of physical degrees of freedom to employ spatial multiplexing of data in optical communication is considered to be the most disruptive and effective solution for meeting the capacity demand of the growing information traffic. Development of space division–multiplexing methods stimulated research on spatial encoding, detection, and processing of data, attracting interest from various fields of science. Here a passive all-dielectric metasurface with near-unity transmission is demonstrated that engineers spatial mode profiles, potentially of an arbitrary complexity. The broadband response of the metasurface covers all S, C, and L bands of fiber communications. Unlike conventional phase plates, the metasurface allows for both phase and polarization conversion, providing full flexibility for the mode engineering. The dielectric metasurface is employed for mode multiplexing in a free-space optical communication system with an extinction ratio in excess of 20 dB over the whole C-band with negligible penalty even for 100 Gb s⁻¹ data transmission. These results merge two seemingly different fields, optical communication and metamaterials, and they suggest a novel approach for an ultimate miniaturization of mode multiplexers and advanced LiFi technologies.

Original language	English
Article number	1800031
Journal	Laser and Photonics Reviews
Volume	12
Issue number	8
DOIs	https://doi.org/10.1002/lpor.201800031
State	Published - Aug 2018

Funding

The authors acknowledge Katie Chong for an initial work on the metasur-face masks and Richard Winfield (Tyndall National Institute) for providing the reference phase plates. Fabrication was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. This work was supported by the Australian Research Council, the Liv-erhulme Visiting Professorship program, the Engineering and Physical Science Research Council (EPSRC) under the grant EP/L000091/1 (PEACE), and EC 7th Framework Program through grants 627545 (SOLAS), 659950 (INVENTION), and 654809 (HSPACE). The authors acknowledge Katie Chong for an initial work on the metasurface masks and Richard Winfield (Tyndall National Institute) for providing the reference phase plates. Fabrication was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. This work was supported by the Australian Research Council, the Liverhulme Visiting Professorship program, the Engineering and Physical Science Research Council (EPSRC) under the grant EP/L000091/1 (PEACE), and EC 7th Framework Program through grants 627545 (SOLAS), 659950 (INVENTION), and 654809 (HSPACE).

Funders	Funder number
7th Framework Program	659950, 654809, 627545
U.S. Department of Energy
Engineering and Physical Sciences Research Council	EP/L000091/1
Australian Research Council

Keywords

metasurfaces
nanophotonics
optical communications
space division multiplexing

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10.1002/lpor.201800031

Cite this

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abstract = "Expanding the use of physical degrees of freedom to employ spatial multiplexing of data in optical communication is considered to be the most disruptive and effective solution for meeting the capacity demand of the growing information traffic. Development of space division–multiplexing methods stimulated research on spatial encoding, detection, and processing of data, attracting interest from various fields of science. Here a passive all-dielectric metasurface with near-unity transmission is demonstrated that engineers spatial mode profiles, potentially of an arbitrary complexity. The broadband response of the metasurface covers all S, C, and L bands of fiber communications. Unlike conventional phase plates, the metasurface allows for both phase and polarization conversion, providing full flexibility for the mode engineering. The dielectric metasurface is employed for mode multiplexing in a free-space optical communication system with an extinction ratio in excess of 20 dB over the whole C-band with negligible penalty even for 100 Gb s−1 data transmission. These results merge two seemingly different fields, optical communication and metamaterials, and they suggest a novel approach for an ultimate miniaturization of mode multiplexers and advanced LiFi technologies.",

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AU - Neshev, Dragomir

AU - Turitsyn, Sergey

AU - Kivshar, Yuri

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Transparent Dielectric Metasurfaces for Spatial Mode Multiplexing

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