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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 6 — Feb. 20, 2010
  • pp: 950–954

Light focusing at metallic annular slit structure coated with dielectric layers

Hyungduk Ko, Hyun Chul Kim, and Mosong Cheng  »View Author Affiliations

Applied Optics, Vol. 49, Issue 6, pp. 950-954 (2010)

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We report the focusing of a normally incident plane wave of 405 nm through a Ag/dielectric annular ring structure, using finite-difference time domain analysis. We first study the dependency of the focusing efficiency on slit width when the incident wave is transmitted through a single ring whose slit is filled with a dielectric. Then, light focusing by the multiple-ring structure is investigated as a function of the dielectric thickness. It is observed that the focusing is tunable between near-field and quasi-far-field regimes in the Ag/dielectric layered annular ring structure. Also, the focal intensities are remarkably enhanced by the addition of the dielectric layer, showing a Fabry–Perot-like resonance with respect to the thickness of the dielectric layer. The controllable near-field and far-field focusing offers more flexibility for applications of future nano-optic devices.

© 2010 Optical Society of America

OCIS Codes
(240.0240) Optics at surfaces : Optics at surfaces
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Optics at Surfaces

Original Manuscript: September 18, 2009
Revised Manuscript: January 19, 2010
Manuscript Accepted: January 23, 2010
Published: February 12, 2010

Virtual Issues
Vol. 5, Iss. 5 Virtual Journal for Biomedical Optics

Hyungduk Ko, Hyun Chul Kim, and Mosong Cheng, "Light focusing at metallic annular slit structure coated with dielectric layers," Appl. Opt. 49, 950-954 (2010)

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