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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 22, Iss. 5 — May. 1, 2005
  • pp: 992–997

Generating Bessel beams by use of localized modes

W. B. Williams and J. B. Pendry  »View Author Affiliations

JOSA A, Vol. 22, Issue 5, pp. 992-997 (2005)

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We propose a novel method for generating both propagating and evanescent Bessel beams. To generate propagating Bessel beams we propose using a pair of distributed Bragg reflectors (DBRs) with a resonant point source on one side of the system. Those modes that couple with the localized modes supported by the DBR system will be selectively transmitted. This is used to produce a single narrow band of transmission in κ space that, combined with the circular symmetry of the system, yields a propagating Bessel beam. We present numerical simulations showing that a propagating Bessel beam with central spot size of 0.5 λ 0 can be maintained for a distance in excess of 3000 λ 0 . To generate evanescent Bessel beams we propose using transmission of a resonant point source through a thin film. A transmission resonance is produced as a result of the multiple scattering occurring between the interfaces. This narrow resonance combined with the circular symmetry of the system corresponds to an evanescent Bessel beam. Because propagating modes are also transmitted, although the evanescent transmission resonance is many orders of magnitude greater than the transmission for the propagating modes, within a certain distance the propagating modes swamp the exponentially decaying evanescent ones. Thus there is only a certain regime in which evanescent Bessel beams dominate. However, within this regime the central spot size of the beam can be made significantly smaller than the wavelength of light used. Thus evanescent Bessel beams may have technical application, in high-density recording for example. We present numerical simulations showing that with a simple glass thin film an evanescent Bessel beam with central spot size of 0.34 λ 0 can be maintained for a distance of 0.14 λ 0 . By choice of different material parameters, the central spot size can be made smaller still.

© 2005 Optical Society of America

OCIS Codes
(230.1480) Optical devices : Bragg reflectors
(240.0310) Optics at surfaces : Thin films
(260.1960) Physical optics : Diffraction theory
(260.5740) Physical optics : Resonance

Original Manuscript: September 10, 2004
Revised Manuscript: November 26, 2004
Manuscript Accepted: December 2, 2004
Published: May 1, 2005

W. B. Williams and J. B. Pendry, "Generating Bessel beams by use of localized modes," J. Opt. Soc. Am. A 22, 992-997 (2005)

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