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Journal of Applied Physics / Volume 107 / Issue 9 / ARTICLES / Lasers, Optics, and Optoelectronics

J. Appl. Phys. 107, 093102 (2010); http://dx.doi.org/10.1063/1.3407518 (5 pages)

Two-dimensional subwavelength-focused imaging using a near-field probe at a λ/4 working distance

Loïc Markley and George V. Eleftheriades

The Edward S. Rogers Sr. Department of Electrical and Computer Engineering, University of Toronto, 40 St. George Street, Toronto, Ontario M5S 2E4, Canada

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(Received 25 February 2010; accepted 24 March 2010; published online 4 May 2010)

Two-dimensional (2D) subwavelength imaging using a near-field antenna array probe is demonstrated experimentally at a probe-to-object separation distance of λ/4. Field perturbations caused by the presence of small objects are detected by monitoring the input reflection coefficient as the probe is scanned. The probe is designed to produce a subwavelength focal spot with a 0.217λ full-width half-maximum beam width. Propagating components are suppressed through destructive interference, enhancing the evanescent field enough to resolve objects spaced by 0.259λ. The poor resolving capability of a conventional single-element probe at this working distance is also addressed; it is shown that even objects spaced over a wavelength apart are inaccurately detected. A full 2D imaging experiment is carried out using eight scattered objects. The single element probe is unable to resolve any of the objects, while all but the two most closely spaced pairs are resolved by the array probe.

© 2010 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. DESIGN AND SIMULATION
  3. FABRICATION AND APPARATUS
  4. EXPERIMENTAL RESULTS
  5. CONCLUSION

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KEYWORDS and PACS

Keywords

antenna arrays, interference (signal), optical resolving power

PACS

  • 84.40.Ba

    Antennas: theory, components and accessories

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3407518

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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