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Opt Express. 2010 Apr 26;18(9):9643-50. doi: 10.1364/OE.18.009643.

Superfocusing terahertz waves below lambda/250 using plasmonic parallel-plate waveguides.

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  • 1Department of Electrical and Computer Engineering, MS-366, Rice University, Houston, Texas 77251, USA.

Abstract

We experimentally demonstrate complete two-dimensional (2-D) confinement of terahertz (THz) energy in finite-width parallel-plate waveguides, defying conventional wisdom in the century-old field of microwave waveguide technology. We find that the degree of energy confinement increases exponentially with decreasing plate separation. We propose that this 2-D confinement is mediated by the mutual coupling of plasmonic edge modes, analogous to that observed in slot waveguides at optical wavelengths. By adiabatically tapering the width and the separation, we focus THz waves down to a size of 10 microm (approximately lambda/260) by 18 microm ( approximately lambda/145), which corresponds to a mode area of only 2.6 x 10(-5) lambda(2).

PMID:
20588812
[PubMed]
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