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Eliminating ± 1st orders by double-groove microstructure for three-branch electromagnetic wave splitting

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Abstract

We investigated a three-channel reflective grating beam splitter with double-groove which eliminated ± 1st orders under TE and TM polarization. The grating has a polarization-dependent structure with different ridge thicknesses under TE and TM polarizations. Inhibitions of ± 1st orders are rarely reported from the previous work. The diffraction efficiency of the 0th order and ± 2nd orders for TE polarization orders can reach 32.7% and 33.3%, respectively. And the diffraction efficiency of 0th order and ± 2nd orders for TM polarization can reach 32.9% and 31.9%, respectively. It indicates that the uniformity of diffraction efficiency under the two polarizations also reaches more than 95%. The excellent bandwidth and tolerance make this grating suitable for a wide range of applications in the optical field. Compared conventional three-channel splitting, inhibitions of ± 1st orders are presented by double-groove microstructure.

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Funding

This work is supported by the Key Laboratory of Biomedical Imaging Science and System, Chinese Academy of Sciences.

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Authors and Affiliations

  1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou, 510006, China

    Xiaofeng Wang, Bo Wang & Jinhai Huang

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  1. Xiaofeng Wang
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  2. Bo Wang
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  3. Jinhai Huang
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Contributions

XW: Data curation, Validation, Investigation, Writing—original draft. BW: Conceptualization, Methodology, Supervision, Project administration, Writing- review & editing. JH: Formal analysis.

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Correspondence to Bo Wang.

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The datasets analyzed during the current study are available in the present article.

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Wang, X., Wang, B. & Huang, J. Eliminating ± 1st orders by double-groove microstructure for three-branch electromagnetic wave splitting. Opt Quant Electron 56, 523 (2024). https://doi.org/10.1007/s11082-023-06120-w

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