Determination of the permittivity of nematic liquid crystals in the microwave region
作者： Fuzi Yang , John Roy Sambles
DOI: 10.1080/0267829031000097466
关键词: Materials science 、 Liquid crystal 、 Microscope 、 Microwave 、 Perpendicular 、 Polarization (waves) 、 Aperture 、 Anisotropy 、 Optics 、 Permittivity
摘要: Two 3 mm thick microscope glass plates, having one face plus their two long edges coated by a metallic film, are spaced 75 μm apart mylar spacers. Because of the coatings on inner faces structure acts as single slit. The space between plates is filled with aligned nematic liquid crystal (E7, Merck/BDH) and cell inserted in an absorber aperture. This slit geometry supports resonant modes when microwaves incident polarization (E-field) perpendicular to gives set Fabry-Perot-like transmission frequencies. These frequencies move voltage applied being first homogeneously, then realigning homeotropically field. By minotoring these changes fast easy use procedure for determining permittivity its anisotropy crystals microwave region has been developed. parameters d...
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