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Combination of Surface Plasmon Polaritons and Subwavelength Grating for Polarization Beam Splitting

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Abstract

A polarization beam splitter (PBS) based on the plasmonic subwavelength grating (PSWG) is proposed and investigated. The PBS is composed by a directional coupler with a PSWG as the coupling region, which offers additional freedom for index tailoring. The mode properties are strongly modified by the unique structure of the PSWG resulting in selective coupling with the two polarization states in the neighbor waveguides. The calculations show that the insertion loss of PBS is less than 1 dB, and the extinction ratios of transverse electric and transverse magnetic polarizations are as high as 27 dB and 30 dB respectively with nearly 4-μm coupling region length. In addition, the fabrication tolerance of the device is investigated in detail.

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Funding

This work was supported by the National Natural Science Foundation of China under grant 61605179; the Wuhan Science and Technology Bureau under grant 2018010401011297; the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) under grants 162301132703, G1323511794, and CUG2018JM16; and the Experimental Technology Research Funds under grant SJ-201816.

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Authors and Affiliations

  1. School of Mechanical Engineering and Electronic Information, China University of Geosciences (Wuhan), Wuhan, China

    Yuan Xie, Zhenxing Chen, Jun Yan, Yiheng Wu, Tianye Huang & Zhuo Cheng

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  1. Yuan Xie
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  2. Zhenxing Chen
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  3. Jun Yan
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  4. Yiheng Wu
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  5. Tianye Huang
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  6. Zhuo Cheng
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Correspondence to Tianye Huang or Zhuo Cheng.

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Xie, Y., Chen, Z., Yan, J. et al. Combination of Surface Plasmon Polaritons and Subwavelength Grating for Polarization Beam Splitting. Plasmonics 15, 235–241 (2020). https://doi.org/10.1007/s11468-019-01032-6

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  • DOI: https://doi.org/10.1007/s11468-019-01032-6

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