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Tunable TE/TM mode converter with an orthogonal graphene-based grating structure

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Abstract

A novel TM/TE polarization converter constructed with orthogonal double-layer graphene gratings is proposed. The high-performance TM/TE polarization conversion was explored by optimizing the Fermi energy and geometric parameters of the two-layer graphene gratings. As the Fermi level of graphene is dynamically adjustable, tunable polarization modulation can be achieved by the same design. Here we utilize the finite element method and improved coupled-mode theory to simulate and verify the conversion and modulation characteristics of TM and TE polarization. Proof-of-concept experiments demonstrated that this TM/TE converter provided excellent optical efficiency in polarization conversion and strong modulation stability against incident wave angle (up to 30°) and polarization status. This simple and easy-to-implement grating structure paves the way for the development of future micro-nano devices such as unimodal filters, and its functions can be further translated to study absorption and reflection spectra in nanophotonic applications.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (11811530052); Intergovernmental Science and Technology Regular Meeting Exchange Project of Ministry of Science and Technology of China (CB02-20); Open Fund of State Key Laboratory of Applied Optics (SKLAO2020001A04); Undergraduate Research and Innovation Projects of Jiangnan University (2020366Y).

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Authors and Affiliations

  1. School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University, Wuxi, 214122, China

    Yiqing Wang, Wenjie Shi, Qian Li, Yifan Chen & Jicheng Wang

  2. State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, China

    Jicheng Wang

  3. School of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen, 518055, Guangdong, China

    Wei Liu

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  1. Yiqing Wang
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  2. Wenjie Shi
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  3. Qian Li
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  4. Yifan Chen
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  5. Jicheng Wang
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  6. Wei Liu
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Correspondence to Jicheng Wang or Wei Liu.

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Wang, Y., Shi, W., Li, Q. et al. Tunable TE/TM mode converter with an orthogonal graphene-based grating structure. Eur. Phys. J. Spec. Top. 231, 589–595 (2022). https://doi.org/10.1140/epjs/s11734-021-00382-9

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  • DOI: https://doi.org/10.1140/epjs/s11734-021-00382-9

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