Tunable near-infrared polarization generator based on graphene-loaded ultra-thin silver nanoslits array

Rui Wang; Ti Sun; Chinhua Wang

doi:10.1117/12.2644374

9 September 2022 Tunable near-infrared polarization generator based on graphene-loaded ultra-thin silver nanoslits array

Rui Wang, Ti Sun, Chinhua Wang

Author Affiliations +

Proceedings Volume 12328, Second International Conference on Optics and Image Processing (ICOIP 2022); 123280A (2022) https://doi.org/10.1117/12.2644374
Event: Second International Conference on Optics and Image Processing (ICOIP 2022), 2022, Taian, China

Abstract

Dynamic manipulation of the polarization state of light has essential applications in many fields, including optical communication, holographic display, and imaging. To date, graphene-loaded polarization devices have been reported mainly working in mid-infrared and THz wavelength bands. Here, we propose a tunable reflective polarization generator working at the wavelength of 1.55 μm based on graphene-loaded ultra-thin silver nanoslits array. The physical mechanism of the device is based on the perturbation effect of plasmonic resonance. The Fermi level (E_f) of graphene is adjusted to change its permittivity around the plasmon mode excited by the incident light whose polarization direction is perpendicular to the direction of nanoslits, and subsequently to change the resonance frequency to obtain a dynamic tunability of the polarization state of the reflected light. For a normal linear incident light with a polarization orientation angle of 35º with respect to the slit direction, the polarization states of the reflected light can be tuned to right-handed circular polarization (RCP), left-handed circular polarization (LCP), and linear polarization (LP), when graphene’s E_f is adjusted to 0.53 eV, 0.71 eV, and 1 eV by applying a gate voltage, respectively. Also, continuous ellipticity of circular polarization state of reflected light can be tuned by continuously changing graphene’s E_f. The proposed tunable device makes it possible to rapidly and dynamically encode polarization information in optical communication bands, which will have tremendous applications in the field of polarization division multiplexing.

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Rui Wang, Ti Sun, and Chinhua Wang "Tunable near-infrared polarization generator based on graphene-loaded ultra-thin silver nanoslits array", Proc. SPIE 12328, Second International Conference on Optics and Image Processing (ICOIP 2022), 123280A (9 September 2022); https://doi.org/10.1117/12.2644374

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KEYWORDS

Graphene

Polarization

Silver

Metals

Plasmonics

Surface plasmons

Near infrared

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