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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 5 — Mar. 1, 2010
  • pp: 4961–4971

Three-dimensional mapping of optical near field of a nanoscale bowtie antenna

Rui Guo, Edward C. Kinzel, Yan Li, Sreemanth M. Uppuluri, Arvind Raman, and Xianfan Xu  »View Author Affiliations

Optics Express, Vol. 18, Issue 5, pp. 4961-4971 (2010)

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Ridge nanoscale aperture antennas have been shown to be a high transmission nanoscale light source. They provide a small, polarization-dependent near-field optical spot with much higher transmission efficiency than circularly-shaped apertures with similar field confinement. This provides significant motivations to understand the electromagnetic fields in the immediate proximity to the apertures. This paper describes an experimental three-dimensional optical near-field mapping of a bowtie nano-aperture. The measurements are performed using a home-built near-field scanning optical microscopy (NSOM) system. An aluminum coated Si3N4 probe with a 150 nm hole at the tip is used to collect optical signals. Both contact and constant-height scan (CHS) modes are used to measure the optical intensity at different longitudinal distances. A force-displacement curve is used to determine the tip-sample separation distance allowing the optical intensities to be mapped at distances as small as 50 nm and up to micrometer level. The experimental results also demonstrate the polarization dependence of the transmission through the bowtie aperture. Numerical simulations are also performed to compute the aperture’s electromagnetic near-field distribution and are shown to agree with the experimental results.

© 2010 OSA

OCIS Codes
(180.4243) Microscopy : Near-field microscopy
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:

Original Manuscript: January 19, 2010
Revised Manuscript: February 14, 2010
Manuscript Accepted: February 17, 2010
Published: February 24, 2010

Rui Guo, Edward C. Kinzel, Yan Li, Sreemanth M. Uppuluri, Arvind Raman, and Xianfan Xu, "Three-dimensional mapping of optical near field of a nanoscale bowtie antenna," Opt. Express 18, 4961-4971 (2010)

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