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Applied Optics

Applied Optics


  • Vol. 39, Iss. 16 — Jun. 1, 2000
  • pp: 2545–2550

Optical effect of diffractive multifocal focusing of radiation on a bicomponent diffraction system

Renat R. Letfullin and Thomas F. George  »View Author Affiliations

Applied Optics, Vol. 39, Issue 16, pp. 2545-2550 (2000)

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It is shown for the first time, to our knowledge, that when a plane wave illuminates a certain type of bicomponent optical system, consisting of two plane screens with circular apertures on a given optical axis, a multifocal diffractive focusing effect can appear. Here the diffraction picture in the focal planes represents the circular nonlocal bands of the Fresnel zones with a bright narrow peak at the center, whose intensity can exceed by 6–10 times the value of the incident-wave intensity. The detected optical effect is observed across a wide range of wavelengths, λ = 0.4–103 µm, and ratios of the aperture diameters d1 ≥ 2d2 = 25–1000λ, and it is also insensitive to changes in the medium of the wave propagation. For the large diameters of input holes, d1 = 2d2 > 100λ, or for wavelengths in the radio-frequency region of the spectrum, the bicomponent diffraction system acts as a long-focus lens with a high-intensity Gaussian distribution of radiation, at times exceeding the initial intensity, persisting at large distances (z = 1–100 cm) from the diffraction system.

© 2000 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(050.1970) Diffraction and gratings : Diffractive optics
(080.3620) Geometric optics : Lens system design
(220.2560) Optical design and fabrication : Propagating methods
(220.3630) Optical design and fabrication : Lenses
(220.4830) Optical design and fabrication : Systems design

Original Manuscript: October 28, 1999
Revised Manuscript: February 9, 2000
Published: June 1, 2000

Renat R. Letfullin and Thomas F. George, "Optical effect of diffractive multifocal focusing of radiation on a bicomponent diffraction system," Appl. Opt. 39, 2545-2550 (2000)

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