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Strong Focusing of Plasmonic Lens with Nanofinger and Multiple Concentric Rings Under Radially Polarized Illumination

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Abstract

The strong focusing and field enhancement effects of a metal nanofinger surrounded by multiple concentric rings are investigated through both COMSOL Multiphysics and finite-difference time-domain (FDTD) simulations. The aspect ratio of the nanofinger is the main parameter determining the full width at half maximum (FWHM) and the strong local field enhancement. The optimal values of the aspect ratio for the maximal enhancement and minimal FWHM are close to 1.8 and 3.0, respectively. Furthermore, the optimal aspect ratio of maximal field enhancement intensity decreases linearly with the incident wavelength, and the optimal aspect ratio of minimal FWHM increases linearly with the metal film thickness. The nanofinger fabricated with the focused ion beam method has a small conical angle, which results in a higher field enhancement and smaller focal spot size than straight sidewall finger. However, the shorter finger defect deteriorates FWHM and field enhancement because of the bias from the optimal aspect ratio value.

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Acknowledgments

This work is financially supported by the National Natural Science Foundation of China (NSFC) with grant no. 91123033.

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Authors and Affiliations

  1. State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, China

    Jiaxin Ji & Yonggang Meng

  2. State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing, 100084, China

    Lin Sun, Xiaoyu Wu & Jia Wang

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  1. Jiaxin Ji
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  2. Yonggang Meng
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  3. Lin Sun
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  4. Xiaoyu Wu
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  5. Jia Wang
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Correspondence to Yonggang Meng.

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Ji, J., Meng, Y., Sun, L. et al. Strong Focusing of Plasmonic Lens with Nanofinger and Multiple Concentric Rings Under Radially Polarized Illumination. Plasmonics 11, 23–27 (2016). https://doi.org/10.1007/s11468-015-0015-2

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  • DOI: https://doi.org/10.1007/s11468-015-0015-2

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