Journal article

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

Krenz P, Olmon R, Lail B, Raschke M, Boreman G ...see all

Optics express, vol. 18, issue 21 (2010) pp. 21678-21686

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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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  • Peter M Krenz

  • Robert L Olmon

  • Brian A Lail

  • Markus B Raschke

  • Glenn D Boreman

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