title: Spectroscopy of polycrystalline materials using thinned-substrate planar Goubau line at cryogenic temperatures.
abstract: 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.
authors: School of Electronic and Electrical Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK. el06cr@leeds.ac.uk.
authors: Christopher
authors: C
authors: Russell
authors: Christopher D
authors: CD
authors: Wood
authors: Andrew D
authors: AD
authors: Burnett
authors: Lianhe
authors: L
authors: Li
authors: Edmund H
authors: EH
authors: Linfield
authors: A Giles
authors: AG
authors: Davies
authors: John E
authors: JE
authors: Cunningham
mesh_terms: D005615:Freezing; D046208:Microchip Analytical Procedures / Q000379:methods*; D013057:Spectrum Analysis