Long-range guided THz radiation by thin layers of water

R. Sczech, J. Gómez Rivas, A. Berrier, V. Giannini, G. Pirruccio, C. Debus, H. Schäfer-Eberwein, P. Haring Bolivar

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)
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We propose a novel method to guide THz radiation with low losses along thin layers of water. This approach is based on the coupling of evanescent surface fields at the opposite sides of the thin water layer surrounded by a dielectric material, which leads to a maximum field amplitude at the interfaces and a reduction of the energy density inside the water film. In spite of the strong absorption of water in this frequency range, calculations show that the field distribution can lead to propagation lengths of several centimeters. By means of attenuated total reflection measurements we demonstrate the coupling of incident THz radiation to the long-range surface guided modes across a layer of water with a thickness of 24 µm. This first demonstration paves the way for THz sensing in aqueous environments.
Original languageEnglish
Pages (from-to)27781-27791
Number of pages10
JournalOptics Express
Issue number25
Publication statusPublished - 2012


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