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Planar Gradient Hyperbolic Secant Lens for Subwavelength Focusing and Superresolution Imaging

Received: 3 December 2012    Accepted:     Published: 30 December 2012
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Abstract

Integral relations to describe the propagation of a TE-wave from an external point source through the two-dimensional medium (plane interface) and the plane-parallel plate are proposed. We discuss three types of waves that contribute to the resulting light field, namely, the propagating waves and the first- and second-type surface waves. The comparison of near-field refractive lenses (SIL, NAIL) and a planar hyperbolic secant lens shows their numerical apertures to have close values, with the difference being as small as 5% for the Si-based optical elements. The FDTD-method simulation shows that by combining the gradient-index hyperbolic secant lens with a subwavelength diffraction grating or replacing it with its binary analog, the focal spot size can be made, respectively, 10% and 20% smaller than the diffraction-limited resolution in the 2D medium. We design a Si-based, planar binary microlens to generate a near-surface focal spot of full-width half-maximum size FWHM=0.102λ, where λ is the incident wavelength, which is practically devoid of side-lobes. It is shown that about 10 percent of the total incident beam energy goes to the far-field zone.

DOI 10.11648/j.optics.20120101.11
Published in Optics (Volume 1, Issue 1, December 2012)
Page(s) 1-10
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This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

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Copyright © The Author(s), 2024. Published by Science Publishing Group

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Keywords

Superresolution, Gradient-Index Lens, Secant Lens, Near-Field Lenses

References
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  • APA Style

    V. V. Kotlyar, A. A. Kovalev, A. G. Nalimov. (2012). Planar Gradient Hyperbolic Secant Lens for Subwavelength Focusing and Superresolution Imaging. Optics, 1(1), 1-10. https://doi.org/10.11648/j.optics.20120101.11

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    ACS Style

    V. V. Kotlyar; A. A. Kovalev; A. G. Nalimov. Planar Gradient Hyperbolic Secant Lens for Subwavelength Focusing and Superresolution Imaging. Optics. 2012, 1(1), 1-10. doi: 10.11648/j.optics.20120101.11

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    AMA Style

    V. V. Kotlyar, A. A. Kovalev, A. G. Nalimov. Planar Gradient Hyperbolic Secant Lens for Subwavelength Focusing and Superresolution Imaging. Optics. 2012;1(1):1-10. doi: 10.11648/j.optics.20120101.11

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  • @article{10.11648/j.optics.20120101.11,
      author = {V. V. Kotlyar and A. A. Kovalev and A. G. Nalimov},
      title = {Planar Gradient Hyperbolic Secant Lens for Subwavelength Focusing and Superresolution Imaging},
      journal = {Optics},
      volume = {1},
      number = {1},
      pages = {1-10},
      doi = {10.11648/j.optics.20120101.11},
      url = {https://doi.org/10.11648/j.optics.20120101.11},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.optics.20120101.11},
      abstract = {Integral relations to describe the propagation of a TE-wave from an external point source through the two-dimensional medium (plane interface) and the plane-parallel plate are proposed. We discuss three types of waves that contribute to the resulting light field, namely, the propagating waves and the first- and second-type surface waves. The comparison of near-field refractive lenses (SIL, NAIL) and a planar hyperbolic secant lens shows their numerical apertures to have close values, with the difference being as small as 5% for the Si-based optical elements. The FDTD-method simulation shows that by combining the gradient-index hyperbolic secant lens with a subwavelength diffraction grating or replacing it with its binary analog, the focal spot size can be made, respectively, 10% and 20% smaller than the diffraction-limited resolution in the 2D medium. We design a Si-based, planar binary microlens to generate a near-surface focal spot of full-width half-maximum size FWHM=0.102λ, where λ is the incident wavelength, which is practically devoid of side-lobes. It is shown that about 10 percent of the total incident beam energy goes to the far-field zone.},
     year = {2012}
    }
    

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    T1  - Planar Gradient Hyperbolic Secant Lens for Subwavelength Focusing and Superresolution Imaging
    AU  - V. V. Kotlyar
    AU  - A. A. Kovalev
    AU  - A. G. Nalimov
    Y1  - 2012/12/30
    PY  - 2012
    N1  - https://doi.org/10.11648/j.optics.20120101.11
    DO  - 10.11648/j.optics.20120101.11
    T2  - Optics
    JF  - Optics
    JO  - Optics
    SP  - 1
    EP  - 10
    PB  - Science Publishing Group
    SN  - 2328-7810
    UR  - https://doi.org/10.11648/j.optics.20120101.11
    AB  - Integral relations to describe the propagation of a TE-wave from an external point source through the two-dimensional medium (plane interface) and the plane-parallel plate are proposed. We discuss three types of waves that contribute to the resulting light field, namely, the propagating waves and the first- and second-type surface waves. The comparison of near-field refractive lenses (SIL, NAIL) and a planar hyperbolic secant lens shows their numerical apertures to have close values, with the difference being as small as 5% for the Si-based optical elements. The FDTD-method simulation shows that by combining the gradient-index hyperbolic secant lens with a subwavelength diffraction grating or replacing it with its binary analog, the focal spot size can be made, respectively, 10% and 20% smaller than the diffraction-limited resolution in the 2D medium. We design a Si-based, planar binary microlens to generate a near-surface focal spot of full-width half-maximum size FWHM=0.102λ, where λ is the incident wavelength, which is practically devoid of side-lobes. It is shown that about 10 percent of the total incident beam energy goes to the far-field zone.
    VL  - 1
    IS  - 1
    ER  - 

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Author Information
  • Laser Measurements Laboratory of the Image Processing Systems Institute of the Russian Academy of Sciences, 151 Molodogvardeiskaya street, Samara, Russia

  • Laser Measurements Laboratory of the Image Processing Systems Institute of the Russian Academy of Sciences, 151 Molodogvardeiskaya street, Samara, Russia

  • Laser Measurements Laboratory of the Image Processing Systems Institute of the Russian Academy of Sciences, 151 Molodogvardeiskaya street, Samara, Russia

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