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Related Experiment Videos

Generating Bessel beams by use of localized modes.

W B Williams1, J B Pendry

  • 1Condensed Matter Theory Group, The Blackett Laboratory, Imperial College London, London SW7 2BZ, UK. wayne.williams@imperial.ac.uk

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|May 19, 2005
PubMed
Summary

We developed a new method to create Bessel beams, both propagating and evanescent. Using distributed Bragg reflectors or thin films, we achieved sub-wavelength spot sizes for potential applications in high-density recording.

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Applied Physics

Background:

  • Bessel beams offer unique properties like self-reconstruction and non-diffraction.
  • Generating sub-wavelength Bessel beams, especially evanescent ones, is challenging.
  • Existing methods often lack efficiency or precise control over beam characteristics.

Purpose of the Study:

  • To propose and numerically demonstrate a novel method for generating both propagating and evanescent Bessel beams.
  • To achieve Bessel beams with sub-wavelength central spot sizes.
  • To explore potential applications in areas like high-density optical recording.

Main Methods:

  • Propagating Bessel beams: Utilized a pair of distributed Bragg reflectors with a resonant point source for selective transmission.

Related Experiment Videos

  • Evanescent Bessel beams: Employed transmission of a resonant point source through a thin film, leveraging multiple scattering.
  • Numerical simulations were performed to validate the generation and characteristics of both beam types.

    • Main Results:

    • Propagating Bessel beams with a ~0.5λ0 spot size maintained over >3000λ0.
    • Evanescent Bessel beams with a ~0.34λ0 spot size achieved over 0.14λ0 using a glass thin film.
    • Demonstrated the ability to further reduce the spot size of evanescent Bessel beams by adjusting material parameters.

    Conclusions:

    • The proposed methods offer efficient generation of both propagating and evanescent Bessel beams.
    • Achieved sub-wavelength spot sizes, particularly for evanescent Bessel beams, opening possibilities for advanced optical applications.
    • The technique shows promise for high-density data storage and sub-wavelength imaging.