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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 20 — Sep. 26, 2011
  • pp: 19365–19373

The Talbot effect of plasmonic nanolenses

Lingli Li, Yongqi Fu, Hongsheng Wu, Ligong Zheng, Hongxin Zhang, Zhenwu Lu, Qiang Sun, and Weixing Yu  »View Author Affiliations

Optics Express, Vol. 19, Issue 20, pp. 19365-19373 (2011)

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The Talbot effect of an Ag nanolens with five periodic concentric rings that are illuminated by the radially polarized light was numerically studied by means of rigorous finite-difference and time-domain (FDTD) algorithm. It was found that the Talbot effect occurs only when the incident wavelength is at the scale of less than half of period of the grating structures of the nanolenses. Specifically, in this work, the nanolenses with a 500 nm period grating structures has five focal points due to Talbot effect for the incident wavelength of λ = 248 nm. The diameter of the first focal spot after the exit plane in free space is 100 nm. In contrast, we analyzed the corresponding focal points on the basis of Talbot self-imaging by scalar diffraction theory. It was found that the scalar Talbot effect cannot interpret the Talbot effect phenomenon for the metallic nanolenses. It may attribute to the paraxial approximation applied in the Talbot effect theory in far-field region. However, the approximation does not hold in our nanolenses structures during the light propagation. In addition, the Talbot effect appears at the short-wavelength regime only, especially in the ultraviolet wavelength region.

© 2011 OSA

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(070.6760) Fourier optics and signal processing : Talbot and self-imaging effects
(230.6080) Optical devices : Sources
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Optics at Surfaces

Original Manuscript: April 18, 2011
Revised Manuscript: May 13, 2011
Manuscript Accepted: August 27, 2011
Published: September 22, 2011

Lingli Li, Yongqi Fu, Hongsheng Wu, Ligong Zheng, Hongxin Zhang, Zhenwu Lu, Qiang Sun, and Weixing Yu, "The Talbot effect of plasmonic nanolenses," Opt. Express 19, 19365-19373 (2011)

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