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Proceedings Paper

Ultrashort single-mode pulse propagation on CPW with air-bridges observed by photoconductive pump-probe measurement
Author(s): Jongjoo Lee; Joungho Kim
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Paper Abstract

We firstly demonstrate the effects of the air-bridges on the coplanar waveguide (CPW) for the single-mode pulse propagation using a picosecond time-domain pump-probe measurement. The picosecond photoconductive sampling technique is able to measure the transmitted and reflected pulses with a picosecond temporal resolution corresponding to a 300-GHz frequency bandwidth. It is found that more than two of the crossing air-bridges over the CPW are needed to support the single-mode propagation. The crossing air-bridge is found to behave as a bypass capacitor to an incoming pulse. For the air-bridges used for connecting the ground planes along the CPW, the length of the air-bridge is founded more critical. The air-bridges have exhibited more than 30-dB return loss up to 300-GHz. Finally, the s- parameters of open and short terminations were measured using the embedded CPW with the proposed air-bridge structures.

Paper Details

Date Published: 12 November 1999
PDF: 10 pages
Proc. SPIE 3795, Terahertz and Gigahertz Photonics, (12 November 1999); doi: 10.1117/12.370174
Show Author Affiliations
Jongjoo Lee, Korea Advanced Institute of Science and Technology (South Korea)
Joungho Kim, Korea Advanced Institute of Science and Technology (South Korea)

Published in SPIE Proceedings Vol. 3795:
Terahertz and Gigahertz Photonics
R. Jennifer Hwu; Ke Wu, Editor(s)

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