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Proceedings Paper

Enhanced transmission and beam confinement using bullseye plasmonic lenses at THz frequencies
Author(s): Tanner J. Heggie; David A. Naylor; Brad G. Gom; Evgueni V. Bordatchev
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Paper Abstract

A major limitation in terahertz (THz) imaging applications is the relatively poor diffraction limited spatial resolution. A common approach to achieve subwavelength resolution is near-field imaging using a subwavelength aperture, but the low transmission efficiency through the aperture limits the sensitivity of this method. Bullseye structures, consisting of a single subwavelength circular aperture surrounded by concentric periodic corrugations, have been shown to enhance transmission through subwavelength apertures. At optical wavelengths, the fabrication of bullseye structures has been traditionally achieved by lithographic or chemical processes. Since the scale of plasmonic structures depends on the incident wavelength, precision micromilling techniques are well suited for THz applications. In this paper we describe a diamond micromilling process for the fabrication a plasmonic lenses operating at 325 GHz. Theoretical simulations are obtained using an FDTD solver and the performance of the lens is measured using a customized THz test bed.

Paper Details

Date Published: 7 March 2014
PDF: 11 pages
Proc. SPIE 8985, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VII, 89851G (7 March 2014); doi: 10.1117/12.2040335
Show Author Affiliations
Tanner J. Heggie, Univ. of Lethbridge (Canada)
David A. Naylor, Univ. of Lethbridge (Canada)
Brad G. Gom, Univ. of Lethbridge (Canada)
Evgueni V. Bordatchev, National Research Council Canada (Canada)

Published in SPIE Proceedings Vol. 8985:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VII
Laurence P. Sadwick; Créidhe M. O'Sullivan, Editor(s)

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