Spectroscopy of polycrystalline materials using thinned-substrate planar Goubau line at cryogenic temperatures

We investigate the effect of substrate thickness on the transmission bandwidth of on-chip terahertz-frequency-range planar Goubau lines both experimentally and theoretically. The bandwidth and frequency resolution are improved through substrate thinning and geometry modifications (reducing reflectio...

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Bibliographic Details
Published in:Lab on a chip 2013-10, Vol.13 (2), p.465-47
Main Authors: Russell, Christopher, Wood, Christopher D, Burnett, Andrew D, Li, Lianhe, Linfield, Edmund H, Davies, A. Giles, Cunningham, John E
Format: Article
Language:English
Subjects:
Bandwidth
Cryogenic temperature
Freezing
Generators
Lactose
Microchip Analytical Procedures - methods
Recording
Reflection
Spectroscopy
Spectrum Analysis
Thinning
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Summary:We investigate the effect of substrate thickness on the transmission bandwidth of on-chip terahertz-frequency-range planar Goubau lines both experimentally and theoretically. The bandwidth and frequency resolution are improved through substrate thinning and geometry modifications (reducing reflections arising from the THz photoconductive generators and detectors). We demonstrate that the enhanced bandwidth (2 THz) and resolution (3.75 GHz) allows this type of on-chip waveguide to be used for spectroscopic measurements of polycrystalline materials from cryogenic (4 K) to room temperature (292 K) by recording vibrational absorption spectra from overlaid samples of lactose monohydrate. A high frequency resolution on-chip terahertz time domain spectroscopy system for variable temperature studies.
ISSN:1473-0197
1473-0189
DOI:10.1039/c3lc50485a