Journal
JOURNAL OF BIOLOGICAL PHYSICS
Volume 35, Issue 3, Pages 255-264Publisher
SPRINGER
DOI: 10.1007/s10867-009-9161-0
Keywords
Terahertz time-domain spectroscopy; Dielectric mixture; Permittivity model; Leaf water content; Drought stress; Coffea arabica
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Funding
- BMELV in the framework of the project: Terahertz-Messung zur In vivo-Analyse des Trockenstresses bei Nutzpflanzen: Optoelektronisches Messwerkzeug zur selektiven Zuchtung und Kultivierung
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We present an electromagnetic model of plant leaves which describes their permittivity at terahertz frequencies. The complex permittivity is investigated as a function of the water content of the leaf. Our measurements on coffee leaves (Coffea arabica L.) demonstrate that the dielectric material parameters can be employed to determine the leaf water status and, therefore, to monitor drought stress in plant leaves. The electromagnetic model consists of an effective medium theory, which is implemented by a third order extension of the Landau, Lifshitz, Looyenga model. The influence of scattering becomes important at higher frequencies and is modeled by a Rayleigh roughness factor.
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