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Opt Express. 2010 Oct 11;18(21):21678-86. doi: 10.1364/OE.18.021678.

Near-field measurement of infrared coplanar strip transmission line attenuation and propagation constants.

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  • 1College of Optics and Photonics, CREOL, University of Central Florida, Orlando, FL 32816, USA. krenz@knights.ucf.edu

Abstract

Impedance matched and low loss transmission lines are essential for optimal energy delivery through an integrated optical or plasmonic nanocircuit. A novel method for the measurement of the attenuation and propagation constants of an antenna-coupled coplanar strip (CPS) transmission line is demonstrated at 28.3 THz using scattering-type scanning near-field optical microscopy. Reflection of the propagating optical wave upon an open-circuit or short-circuit load at the terminal of the CPS provides a standing voltage wave, which is mapped through the associated surface-normal E(z) electric near-field component at the metal-air interface. By fitting the analytical standing wave expression to the near-field data, the transmission line properties are determined. Full-wave models and measured results are presented and are in excellent agreement.

PMID:
20941067
[PubMed - indexed for MEDLINE]
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