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Enhanced Far-Field Focusing by Plasmonic Lens Under Radially Polarized Beam Illumination

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Abstract

A plasmonic lens with coupling annular grooves is proposed to achieve enhanced far-field focusing performance. Based on the finite difference time domain (FDTD) method, we demonstrate that a focal beam could be obtained under a radially polarized light illumination. The obtained focal length and working distance range from 3.1 to 3.6 μm and 1.7 to 2.1 μm, respectively. The full-width at half-maximum (FWHM) of the focal spot is about 0.8λ i and the overall field enhancement factor is improved to be ∼3.9.

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Acknowledgments

This research is supported by the National Basic Research Program of China (2013CBA01704), the Natural Science Foundation of China (No. 61325023), and the Doctoral Fund of Ministry of Education of China (No. 20130184110015).

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Authors and Affiliations

  1. Center for Information Photonics & Communications, School of Information Science & Technology, Southwest Jiaotong University, Chengdu, Sichuan, 610031, China

    Xiantao Zhang, Lianshan Yan, Yinghui Guo, Wei Pan & Bin Luo

  2. State Key Lab of Optical Technology for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Science, Chengdu, 610029, China

    Xiangang Luo

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  1. Xiantao Zhang
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  2. Lianshan Yan
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  3. Yinghui Guo
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  4. Wei Pan
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  5. Bin Luo
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  6. Xiangang Luo
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Correspondence to Lianshan Yan.

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Zhang, X., Yan, L., Guo, Y. et al. Enhanced Far-Field Focusing by Plasmonic Lens Under Radially Polarized Beam Illumination. Plasmonics 11, 109–115 (2016). https://doi.org/10.1007/s11468-015-0029-9

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  • DOI: https://doi.org/10.1007/s11468-015-0029-9

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