Broadband measurements of dielectric characteristics of ice near 0 ^oC temperature
Bordonskiy G. S.
1, Kazantsev V. A.
11Institute of Natural Resources, Ecology, and Cryology, Siberian Branch, Russian Academy of Sciences, Chita, Russia
Email: lgc255@mail.ru
The paper presents a technique for ultra-wide-band measurements of dielectric permittivity using the microwave and optical ranges of weakly absorbing inhomogeneous media. Measurements of fresh ice near the phase transition point (at 0 oC) were performed. The ratio of the extreme values of the probing frequencies used in the experiments is ~106. The recent detection of a new phenomenon has been confirmed - "enlightenment" (an increase in the transmitted radiation power in fresh ice) in the microwave and optical ranges up to tens of percent or more for samples with a thickness of ~0.1 m. The greatest effect was observed when the electric field vector was positioned parallel to the base plane of the ice crystals. A mechanism of the phenomenon associated with the occurrence of plasmon resonance on structures appearing in nanometer-thick layers formed during the flow (plastic deformation) of ice is proposed. Keywords: dielectric constant, fresh ice, phase transition point, ultra-wide-band measurements, microwave and optical range.
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