A metal-dielectric antenna for terahertz near-field imaging

We present an antenna-based approach to near-field imaging and spectroscopy, which can be used for both continuous-wave and pulsed broadband electromagnetic radiations from microwave to terahertz frequencies. Our near-field antenna consists of a rectangular-shaped block of low-loss dielectric materi...

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Bibliographic Details
Published in:Journal of applied physics 2005-07, Vol.98 (1), p.014910-014910-5
Main Authors: Klein, N., Lahl, P., Poppe, U., Kadlec, F., Kužel, P.
Format: Article
Language:English
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Summary:We present an antenna-based approach to near-field imaging and spectroscopy, which can be used for both continuous-wave and pulsed broadband electromagnetic radiations from microwave to terahertz frequencies. Our near-field antenna consists of a rectangular-shaped block of low-loss dielectric material sharpened to a pyramidal tip which is partially metallized and terminated by a micron-sized plane facet. At this facet the entire energy of the incident wave is concentrated as a very high but strongly localized electric field, which can be used as a sensitive near-field microprobe for electromagnetic radiation. Currently, experiments in reflection geometry with pulsed terahertz radiation and continuous-wave radiation near 80 GHz reveal a frequency-independent spatial resolution of about 20 μ m corresponding to λ ∕ 200 at 80 GHz , which is only limited by the size of the facet terminating the tip.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1978972