Subwavelength-Focused Imaging Using A Near-Field Antenna-Array Probe

Loïc Markley

The Edward S. Rogers Sr. Department of Electrical and Computer Engineering (Electromagnetics)

Abstract:

Over the last decade, the experimental verification of super-resolution using negative-refractive-index lenses has received considerable attention. These works have recently inspired research into near-field focusing structures that can, for some applications, demonstrate the same performance through simpler and more robust implementations.
Tightly spaced antenna arrays can be used to synthesize the near-field with subwavelength resolution through the interference of spatially shifted element beam patterns. This technique is applied to produce tight subwavelength focal spots at a distance of a quarter-wavelength, a distance where losses typically prevent metamaterial lenses from exhibiting super-resolution. These arrays are then used as probes in a two-dimensional subwavelength imaging scheme that operates well outside the extreme near-field used in conventional near-field imaging.

Biography:

Loïc Markley graduated in 2004 from Simon Fraser University with a Bachelor's degree in Electronics Engineering. Sadly saying goodbye to the mountains of British Columbia, he moved to Toronto to join the Electromagnetics Group under Professor Eleftheriades and began research on a planar negative-refractive-index metamaterial structure. He completed his Master?s degree in 2007. After taking time off to travel and consider his options, he is now happily returned to the life of a graduate student. He is currently pursuing his PhD in near-field subwavelength imaging using antenna-array probes.