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Focusing behavior of 2-dimensional plasmonic conical zone plate

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Abstract

A conical configuration plasmonic zone plate based on Fresnel zones made up of Au thin film slits is proposed for focusing in the free space with visible illumination. The surface plasmons enable propagation of radiating modes to distances equal to several wavelengths of the illumination field. Through numerical simulations, the conical structure found to yield focal spot beating the diffraction barrier encountered by conventional focusing elements. The focal spot size measured as full-width at half-maximum (FWHM) is observed to be as small as 0.31 times the illumination wavelength at the focal distance of 8 wavelength. Moreover, the simple design rules make it possible to predict and control the focal distances accurately.

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Acknowledgements

This research was partially supported by Mendeleev scientific fund of Tomsk State University, project 8.2.08.2017, by Tomsk Polytechnic University Competitiveness Enhancement Program Grant, Project Number TPU CEP_INDT_76\2017 and IRCC, IIT Bombay via Seed Grant: Spons/ME/I14079-1/2014.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology Bombay, Mumbai, 400076, India

    Rakesh G. Mote

  2. National Research Tomsk State University, 36 Lenin Ave, Tomsk, Russia, 634050

    Oleg V. Minin

  3. National Research Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk, Russia, 634050

    Igor V. Minin

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  1. Rakesh G. Mote
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  2. Oleg V. Minin
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  3. Igor V. Minin
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Correspondence to Rakesh G. Mote or Igor V. Minin.

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Mote, R.G., Minin, O.V. & Minin, I.V. Focusing behavior of 2-dimensional plasmonic conical zone plate. Opt Quant Electron 49, 271 (2017). https://doi.org/10.1007/s11082-017-1108-2

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