Open AccessNear-field measurement of infrared coplanar strip transmission line attenuation and propagation constants
Author(s) -
Peter M. Krenz,
Robert L. Olmon,
Brian A. Lail,
Markus B. Raschke,
Glenn D. Boreman
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.021678
Subject(s) - optics , attenuation , materials science , transmission line , characteristic impedance , attenuation coefficient , terahertz radiation , near and far field , reflection (computer programming) , reflection coefficient , propagation constant , electric field , physics , telecommunications , quantum mechanics , computer science , programming language
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.
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