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ABSTRACT: In this paper, we report results on an original way to excite surface waves on a single-wire transmission line. Although these waves were proposed many decades ago by Goubau, the novelty of our structures is to achieve a broadband planar excitement. This configuration is very well suited for the terahertz frequency range and allows the investigation of biological entities with high spatial resolution with the use of novel biomicroelectromechanical systems, which include microfluidic functions. From experimental results, we compare different types of transitions from coplanar waveguides, and different substrates are also used. We show that the excitation is highly efficient and broadband for structures on a quartz substrate
IEEE Transactions on Microwave Theory and Techniques 07/2006; · 1.85 Impact Factor
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ABSTRACT: By performing dielectric spectroscopy across a wide spectrum of frequencies (DC-THz), single-cell analysis could be performed without labeling process. That is why we are developing different micro structures, either planar/3D electrodes or transmission lines, and microfluidic devices using BIOMEMS technologies. In our devices, silicon or glass substrates are combined with polymeric materials and gold patterns. For low frequency (LF) applications, PDMS has been chosen while for high frequency (HF) structures, the PPTMDSO is preferred. We are designing the devices thanks to modeling and simulation using either COMSOL (LF) or CST (HF) softwares. Different designs have already been fabricated and are presented in this paper. Finally, we have performed single cell measurements for the low frequency range (<10 MHz) and the next step will focuse on high frequency measurements
Microtechnologies in Medicine and Biology, 2006 International Conference on; 06/2006
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ABSTRACT: We propose and demonstrate an original planar excitation of a single wire transmission line also known as Goubau-Line (G-Line). The excitation is based on an electromagnetic transition between a coplanar waveguide and the desired G-line in a planar configuration. We present some characteristics for this line such as its electromagnetic spatial distribution, its velocity, and results in the frequency domain analysis for the transitions. We will also show some results concerning the shape of the G-line and its influence on the transmission level. From these results, we show that there is a great interest for these structures in the field of biological characterization.
IEEE Microwave and Wireless Components Letters 01/2006; · 1.72 Impact Factor
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ABSTRACT: We report in this communication an original way to excite surface wave on a single wire transmission line. Although these waves have been proposed many decades ago by G. Goubau, the novelty of our structure is to achieve a planar excitement. This configuration is very well suited for the terahertz frequency range and allows the investigation of biological entities with micrometer spatial resolution.
Microwave Conference, 2005 European; 11/2005
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ABSTRACT: The use of terahertz waves is a promising approach for the characterization of the informative molecular assembly and its evolution inside biological cell membranes. In this way we propose a new microprobe which combines microfluidic and microwave structures for measurements in the 140-220 GHz band. This structure, based on a thinned microstrip line, includes an excellent coplanar to microstrip transition in the full band, necessary for the on-wafer vectorial network analyser (VNA) measurements and the future temporal measurement up to 1.5 THz.
Infrared and Millimeter Waves, 2004 and 12th International Conference on Terahertz Electronics, 2004. Conference Digest of the 2004 Joint 29th International Conference on; 11/2004
