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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 11 — May. 25, 2009
  • pp: 9191–9196

Nanofocusing of radially polarized light with dielectric-metal-dielectric probe

Tomasz J. Antosiewicz, Piotr Wróbel, and Tomasz Szoplik  »View Author Affiliations

Optics Express, Vol. 17, Issue 11, pp. 9191-9196 (2009)

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Nanofocusing properties of a tip in the form of a dielectric tapered fiber with metal apertureless coating and dielectric nanocladding can be tuned within a wide spectral range by choice of cladding permittivity. The silica core of diameter decreasing from 2 μm to 5 nm in apex is covered with a silver layer and has a 5 nm dielectric cladding. Internal illumination with a radially polarized Laguerre-Gauss beam guided in fiber is used. In body-of-revolution finite-difference time-domain simulations we find that with an increase of the refractive index of nanocladdings the maximum enhancement occurs for increasingly longer wavelengths.

© 2009 OSA

OCIS Codes
(180.5810) Microscopy : Scanning microscopy
(240.6680) Optics at surfaces : Surface plasmons
(260.5430) Physical optics : Polarization
(180.4243) Microscopy : Near-field microscopy

ToC Category:

Original Manuscript: March 16, 2009
Revised Manuscript: April 17, 2009
Manuscript Accepted: April 29, 2009
Published: May 15, 2009

Virtual Issues
Vol. 4, Iss. 7 Virtual Journal for Biomedical Optics

Tomasz J. Antosiewicz, Piotr Wróbel, and Tomasz Szoplik, "Nanofocusing of radially polarized light with dielectric-metal-dielectric probe," Opt. Express 17, 9191-9196 (2009)

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