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Subwavelength Focusing Using Plasmonic Wavelength-Launched Zone Plate Lenses

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Abstract

We propose a plasmonic wavelength-launched Fresnel zone plate structure for subwavelength focusing. The plasmonic structure consists of a central circular groove surrounded by 12 transparent and opaque zones. All the zones with widths smaller than one half of the incident wavelength are used to enhance the field of evanescent waves in the transmission. Based on the finite-difference time-domain analysis, a focus spot with a full-width at half-maximum of 270 nm (= 0.4λ in ) can be achieved, accompanied by a largely reduced depolarization effect. The sharp waistline indicates that the surface waves are largely converged in the region of focus.

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Acknowledgments

This project is supported by the Agency for Science and Research (A*Star), Singapore, SERC Grant No. 072 101 0023.

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Authors and Affiliations

  1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, 639798, Singapore

    Jun Wang & Wei Zhou

  2. Advanced Photonics and Plasmonics Division, A*STAR Institute of High Performance Computing, 1 Fusionopolis Way, #16-16 Connexis, Singapore, 138632, Singapore

    Wei Zhou & Er-Ping Li

  3. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 639798, Singapore

    Jun Wang & Dao Hua Zhang

Authors
  1. Jun Wang
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  2. Wei Zhou
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  3. Er-Ping Li
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  4. Dao Hua Zhang
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Correspondence to Jun Wang.

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Wang, J., Zhou, W., Li, EP. et al. Subwavelength Focusing Using Plasmonic Wavelength-Launched Zone Plate Lenses. Plasmonics 6, 269–272 (2011). https://doi.org/10.1007/s11468-010-9199-7

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  • DOI: https://doi.org/10.1007/s11468-010-9199-7

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