Terahertz waves can be guided with low losses along thin layers of a strongly absorbing medium embedded in a dielectric. By means of end-fire coupling experiments, we demonstrate the polarization dependent excitation, propagation, and detection of this loss-guided mode, demonstrating long propagation lengths for terahertz radiation along thin water films. Broadband frequency and time resolved analysis using transmission terahertz time domain spectroscopy are performed. A theoretical model is used to isolate the coupled mode from co-propagating spurious modes. Hereby, experimental propagation lengths in the cm range are demonstrated, 2–3 orders of magnitude above the intrinsic propagation length in bulk water.
Experimental evidence for cm propagation lengths of long-range guided terahertz radiation by thin layers of water
Robert Sczech, Daniel Stock, Rainer Bornemann, Peter Haring Bolívar; Experimental evidence for cm propagation lengths of long-range guided terahertz radiation by thin layers of water. Appl. Phys. Lett. 15 July 2013; 103 (3): 031106. https://doi.org/10.1063/1.4813603
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